The 11th century is the period from 1001 to 1100 in accordance with the Julian calendar in the Common Era, the 1st century of the 2nd millennium. In the history of Europe, this period is considered the early part of the High Middle Ages. There was, after a brief ascendancy, a sudden decline of Byzantine power and rise of Norman domination over much of Europe, along with the prominent role in Europe of notably influential popes. In Northern Italy, a growth of population in urban centers gave rise to early organized capitalism and more sophisticated, commercialized culture by the late 11th century. In East Europe, there was the golden age for the principality of Kievan Rus. In Song dynasty China and the classical Islamic world, this century marked the high point for both classical Chinese civilization and technology, classical Islamic science, philosophy and literature. Rival political factions at the Song dynasty court created strife amongst the leading statesmen and ministers of the empire. Chola-era India and Fatimid-era Egypt, had reached their zenith in military might and international influence.
The Western Chalukya Empire rose to power by the end of the century. In this century the Turkish Seljuk dynasty comes to power in Western Asia over the now fragmented Abbasid realm, while the first of the Crusades were waged towards the close of the century. In Japan, the Fujiwara clan continued to dominate the affairs of state. In Korea, the Goryeo Kingdom faced external threats from the Liao dynasty. In Vietnam, the Lý Dynasty began, while in Myanmar the Pagan Kingdom reached its height of political and military power. In the Americas, the Toltec and Mixtec civilizations flourished in Central America, along with the Huari Culture of South America and the Mississippian culture of North America; the Tiwanaku Empire centered around Lake Titicaca collapsed in the first half of the century. In European history, the 11th century is regarded as the beginning of the High Middle Ages, an age subsequent to the Early Middle Ages; the century began while the translatio imperii of 962 was still somewhat novel and ended in the midst of the Investiture Controversy.
It saw the final Christianisation of Scandinavia and the emergence of the Peace and Truce of God movements, the Gregorian Reforms, the Crusades which revitalised a church and a papacy that had survived tarnished by the tumultuous 10th century. In 1054, the Great Schism rent the church in two, however. In Germany, the century was marked by the ascendancy of the Holy Roman Emperors, who hit their high-water mark under the Salians. In Italy, it opened with the integration of the kingdom into the empire and the royal palace at Pavia was summoned in 1024. By the end of the century and Byzantine rule in the Mezzogiorno had been usurped by the Normans and the power of the territorial magnates was being replaced by that of the citizens of the cities in the north. In Britain, it saw the transformation of Scotland into a single, more unified and centralised kingdom and the Norman conquest of England in 1066; the social transformations wrought in these lands brought them into the fuller orbit of European feudal politics.
In France, it saw the nadir of the monarchy and the zenith of the great magnates the dukes of Aquitaine and Normandy, who could thus foster such distinctive contributions of their lands as the pious warrior who conquered Britain and the East and the impious peacelover, the troubadour, who crafted out of the European vernacular its first great literary themes. There were the first figures of the intellectual movement known as Scholasticism, which emphasized dialectic arguments in disputes of Christian theology as well as classical philosophy. In Spain, the century opened with the successes of the last caliphs of Córdoba and ended in the successes of the Almoravids. In between was a period of Christian unification under Navarrese hegemony and success in the Reconquista against the taifa kingdoms that replaced the fallen caliphate. In China, there was a triangular affair of continued war and peace settlements between the Song dynasty, the Tanguts-led Western Xia in the northwest, the Khitans of the Liao dynasty in the northeast.
Meanwhile, opposing political factions evolved at the Song imperial court of Kaifeng. The political reformers at court, called the New Policies Group, were led by Emperor Shenzong of Song and the Chancellors Fan Zhongyan and Wang Anshi, while the political conservatives were led by Chancellor Sima Guang and Empress Dowager Gao, regent of the young Emperor Zhezong of Song. Heated political debate and sectarian intrigue followed, while political enemies were dismissed from the capital to govern frontier regions in the deep south where malaria was known to be fatal to northern Chinese people; this period represents a high point in classical Chinese science and technology, with figures such as Su Song and Shen Kuo, as well as the age where the matured form of the Chinese pagoda was accomplished in Chinese architecture. In India, the Chola Dynasty reached its height of naval power under leaders such as Rajaraja Chola I and Rajendra Chola I, dominating southern India, Sri Lanka, regions of South East Asia.
They sent raids into what is now Thailand. In Japan, the Fujiwara clan dominated central politics by acting as imperial regents, controlling the actions of the Emperor of Japan, who acted as a'puppet monarch' during the Heian period. In the Middle East, the Fatimid Empire of Egypt reached its zenith only to face steep decline, much like the Byzantine Empire in the first half of the century; the Seljuks came to prominence while the Abbasid caliphs held traditional titles without real, tangible authority
Æthelstan or Athelstan was King of the Anglo-Saxons from 924 to 927 and King of the English from 927 to 939 when he died. He was his first wife, Ecgwynn. Modern historians regard him as one of the greatest Anglo-Saxon kings, he never had no children. He was succeeded by Edmund; when Edward died in July 924, Æthelstan was accepted by the Mercians as king. His half-brother Ælfweard may have been recognised as king in Wessex, but died within three weeks of their father's death. Æthelstan encountered resistance in Wessex for several months, was not crowned until September 925. In 927 he conquered the last remaining Viking kingdom, making him the first Anglo-Saxon ruler of the whole of England. In 934 he invaded Scotland and forced Constantine II to submit to him, but Æthelstan's rule was resented by the Scots and Vikings, in 937 they invaded England. Æthelstan defeated them at the Battle of Brunanburh, a victory which gave him great prestige both in the British Isles and on the Continent. After his death in 939 the Vikings seized back control of York, it was not reconquered until 954.
Æthelstan centralised government. These meetings were attended by rulers from outside his territory Welsh kings, who thus acknowledged his overlordship. More legal texts survive from his reign than from any other 10th-century English king, they show his concern about widespread robberies, the threat they posed to social order. His legal reforms built on those of Alfred the Great. Æthelstan was one of the most pious West Saxon kings, was known for collecting relics and founding churches. His household was the centre of English learning during his reign, it laid the foundation for the Benedictine monastic reform in the century. No other West Saxon king played as important a role in European politics as Æthelstan, he arranged the marriages of several of his sisters to continental rulers. By the ninth century the many kingdoms of the early Anglo-Saxon period had been consolidated into four: Wessex, Mercia and East Anglia. In the eighth century, Mercia had been the most powerful kingdom in southern England, but in the early ninth, Wessex became dominant under Æthelstan's great-great-grandfather, Egbert.
In the middle of the century, England came under increasing attack from Viking raids, culminating in invasion by the Great Heathen Army in 865. By 878, the Vikings had overrun East Anglia and Mercia, nearly conquered Wessex; the West Saxons fought back under Alfred the Great, achieved a decisive victory at the Battle of Edington. Alfred and the Viking leader Guthrum agreed on a division that gave Alfred western Mercia, while eastern Mercia was incorporated into Viking East Anglia. In the 890s, renewed Viking attacks were fought off by Alfred, assisted by his son Edward and Æthelred, Lord of the Mercians. Æthelred was married to his daughter Æthelflæd. Alfred was succeeded by Edward. Æthelwold, the son of Æthelred, King Alfred's older brother and predecessor as king, made a bid for power, but was killed at the Battle of the Holme in 902. Little is known of warfare between the English and the Danes over the next few years, but in 909, Edward sent a West Saxon and Mercian army to ravage Northumbria.
The following year the Northumbrian Danes attacked Mercia, but suffered a decisive defeat at the Battle of Tettenhall. Æthelred was succeeded as ruler of Mercia by his widow Æthelflæd. Over the next decade, Edward and Æthelflæd conquered East Anglia. Æthelflæd died in 918 and was succeeded by her daughter Ælfwynn, but in the same year Edward deposed her and took direct control of Mercia. When Edward died in 924, he controlled all of England south of the Humber; the Viking king Sihtric ruled the Kingdom of York in southern Northumbria, but Ealdred maintained Anglo-Saxon rule in at least part of the former kingdom of Bernicia from his base in Bamburgh in northern Northumbria. Constantine II ruled Scotland, apart from the southwest, the British Kingdom of Strathclyde. Wales was divided into a number of small kingdoms, including Deheubarth in the southwest, Gwent in the southeast, Brycheiniog north of Gwent, Gwynedd in the north. According to William of Malmesbury, Æthelstan was thirty years old when he came to the throne in 924, which would mean that he was born around 894.
He was the oldest son of Edward the Elder and the tallest. He was Edward's only son by Ecgwynn. Little is known about Ecgwynn, she is not named in any pre-Conquest source. Medieval chroniclers gave varying descriptions of her rank: one described her as an ignoble consort of inferior birth, while others described her birth as noble. Modern historians disagree about her status. Simon Keynes and Richard Abels believe that leading figures in Wessex were unwilling to accept Æthelstan as king in 924 because his mother had been Edward the Elder's concubine. However, Barbara Yorke and Sarah Foot argue that allegations that Æthelstan was illegitimate were a product of the dispute over the succession, that there is no reason to doubt that she was Edward's legitimate wife, she may have been related to St Dunstan. William of Malmesbury wrote that Alfred the Great honoured his young grandson with a ceremony in which he gave him a scarlet cloak, a belt set with gems, a sword with a gilded scabbard. Medieval Latin scholar Michael Lapid
Socket 939 is a CPU socket released by AMD in June 2004 to supersede the previous Socket 754 for Athlon 64 processors. Socket 939 was succeeded by Socket AM2 in May 2006, it is the second socket designed for AMD's AMD64 range of processors. Socket 939 processors and motherboards became available in June 2004, were superseded by Socket AM2 in May 2006. AMD has ceased the production of this socket to focus on future platforms. However, at least one new Socket 939 motherboard has been produced utilizing a modern AMD chipset since AMD transitioned to Socket AM2. In 2009 motherboard maker ASRock released a new Socket 939 motherboard; the motherboard utilizes a SB710 southbridge. Both single and dual-core processors were manufactured for this socket under the Athlon 64, Athlon 64 FX, Athlon 64 X2, Sempron and Opteron names; the Opteron 190, featuring a 2.8 GHz clock speed and 1 MB of Level 2 cache per core, was the fastest dual-core processor manufactured for this socket, however the availability of this processor was limited.
The Opteron 185 and Athlon 64 FX-60, with a slower clock speed of 2.6 GHz, were the fastest available dual-core processors for the socket. The Opteron 156 ran faster at 3 GHz, making it the fastest single core processor supporting the socket 939 interface, it supports dual channel DDR SDRAM memory, with 6.4 GB/s memory bandwidth. Socket 939 processors support 3DNow!, SSE2, SSE3 instruction sets. It features one 16 bit HyperTransport link running up to 1000 MT/s. In regards to video expansion slots, Socket 939 systems can be found with both AGP slots and PCI-E x16 slots as well. Processors using this socket have 64KB each Level 1 instruction and data caches, either 256KB, 512KB or 1 MB Level 2 cache. List of AMD microprocessors AMD Athlon™ Processor Tech Docs at the Wayback Machine AMD 939-Pin Package Functional Data Sheet at the Wayback Machine
Republic of China (1912–1949)
The Republic of China controlled the Chinese mainland between 1912 and 1949. It was established in January 1912 after the Xinhai Revolution, which overthrew the Qing dynasty, the last imperial dynasty of China, its government moved to Taipei in December 1949 due to the Kuomintang's defeat in the Chinese Civil War. The Republic's first president, Sun Yat-sen, served only before handing over the position to Yuan Shikai, leader of the Beiyang Army, his party led by Song Jiaoren, won the parliamentary election held in December 1912. Song Jiaoren was assassinated shortly after and the Beiyang Army led by Yuan Shikai maintained full control of the Beiyang government. Between late 1915 and early 1916, Yuan Shikai tried to reinstate the monarchy before abdicating due to popular unrest. After Yuan Shikai's death in 1916, members of cliques in the Beiyang Army claimed their autonomy and clashed with each other. During this period, the authority of the Beiyang government was weakened by a restoration of the Qing dynasty.
In 1921, Sun Yat-sen's Kuomintang established a rival government in Canton City, Canton Province, together with the fledgling Communist Party of China. The economy of North China, overtaxed to support warlord adventurism, collapsed between 1927 and 1928. General Chiang Kai-shek, who became KMT leader after Sun Yat-sen's death, started the Northern Expedition military campaign in 1926 to overthrow the Beiyang government, completed in 1928. In April 1927, Chiang established a nationalist government in Nanking, massacred communists in Shanghai, which forced the CPC into armed rebellion, marking the beginning of the Chinese Civil War. There were industrialization and modernization, but conflict between the Nationalist government in Nanking, the CPC, remnant warlords, the Empire of Japan. Nation-building took a backseat to the Second Sino-Japanese War when the Imperial Japanese Army launched an offensive against China in 1937 that turned into a full-scale invasion. After the surrender of Japan at the end of World War II in 1945, the Chinese Civil War resumed in 1946 between the KMT and CPC, with both sides receiving foreign assistance due to the Cold War from the USA and USSR, respectively.
During this period, the 1946 Constitution of the Republic of China replaced the 1928 Organic Law as the Republic's fundamental law. Near the end of the Chinese Civil War in 1949, the Chinese Communist Party established the People's Republic of China, overthrowing the nationalist government on the Chinese mainland; the Government of the Republic of China moved from Nanking to Taipei in 1949, controlling only the Taiwan area after 1949. The official name of the state in the mainland was the "Republic of China". Shortly after the ROC's establishment in 1912, while it was still located on the Chinese mainland, the government used the short form "China" to refer to itself, which derives from zhōng and guó, a term which developed under the Zhou dynasty in reference to its royal demesne, the name was applied to the area around Luoyi during the Eastern Zhou and to China's Central Plain before being used as an occasional synonym for the state during the Qing era; the ROC used alternate names throughout its existence were Republican China or Republican Era, as well as the Beiyang government, the Nationalist government.
A republic was formally established on 1 January 1912 following the Xinhai Revolution, which itself began with the Wuchang Uprising on 10 October 1911 overthrowing the Qing dynasty and ending over two thousand years of imperial rule in China. From its founding until 1949 it was based on mainland China. Central authority waxed and waned in response to warlordism, Japanese invasion, a full-scale civil war, with central authority strongest during the Nanjing Decade, when most of China came under the control of the Kuomintang under an authoritarian one-party military dictatorship. At the end of World War II in 1945, the Empire of Japan surrendered control of Taiwan and its island groups to the Allies, Taiwan was placed under the Republic of China's administrative control; the communist takeover of mainland China in the Chinese Civil War in 1949 left the ruling Kuomintang with control over only Taiwan, Kinmen and other minor islands. With the 1949 loss of mainland China in the civil war, the ROC government retreated to Taiwan and the KMT declared Taipei the provisional capital.
The Communist Party of China took over all of mainland China and founded the People's Republic of China in Beijing. In 1912, after over two thousand years of imperial rule, a republic was established to replace the monarchy; the Qing dynasty that preceded the republic experienced a century of instability throughout the 19th century, suffered from both internal rebellion and foreign imperialism. The ongoing instability led to the outburst of Boxer Rebellion in 1900, whose attacks on foreigners led to the invasion by the Eight Nation Alliance. China signed the Boxer Protocol and paid a large indemnity to the foreign powers: 450 million taels of fine silver. A program of institutional reform proved too late. Only the lack of an alternative regime prolonged its existence until 1912; the establishment of the Chinese Republic developed out of the Wuchang Uprising against the Qing government on 10 October 1911. That date is now celebrated annually as the ROC's national day known as the "Double Ten Day".
On 29 December 1911, Sun Yat-sen was elected president b
The 9th century was a period from 801 to 900 in accordance with the Julian calendar in the Common Era. Around the 9th century the Edo people of what is now southeastern Nigeria developed bronze casts of humans and mythical creatures; these bronzes, which were used as vessels, amulets and sacrificial tools, are among the earliest made bronzes found in Nigeria. Most items were part of a burial of a nobleman culture in the northern part of benin empire. Evidence of long distance trade between benin empire and poutugist was discovered through the thousands of glass beads found at Old Cairo at the workshops of Fustat; the development of the Benin Kingdom can be attributed to the proficiency at advanced metallurgy seen in the bronze jewelry crafted by local artisans. The Ghana Empire was located in what is now western Mali, it is considered the first of the Sahelian Kingdoms, which would exist in some form until the early 20th century. Britain experienced a great influx of Viking peoples in the 9th century as the Viking Age continued from the previous century.
The kingdoms of the Heptarchy were conquered by the Danes, who set up Anglo-Saxon puppet rulers in each kingdom. This invasion was achieved by a huge military force known as the Great Heathen Army, led by Ivar the Boneless, Halfdan Ragnarsson, Guthrum; this Danish army first arrived in Britain in 865 in East Anglia. After conquering that kingdom, the army proceeded to capture the city of York and establish the kingdom of Jorvik; the Danes went on to subjugate the kingdom of Northumbria and to take all but the western portion of Mercia. The remaining kingdom of Wessex was the only kingdom of the Heptarchy left. Alfred the Great managed to maintain his kingdom of Wessex and push back the Viking incursions, relieving the neighbouring kingdoms from the threat of the Danes following his famous victory over them at the Battle of Ethandun in 878. Alfred re-established Anglo-Saxon rule over the western half of Mercia, the Danelaw was established which separated Mercia into halves, the eastern half remaining under the control of the Danes.
Ireland was affected by the Viking expansion across the North Sea. Extensive raids were carried out all along the coast and permanent settlements were established, such as that of Dublin in 841. Particular targets for these raids were the monasteries on the western coast of Ireland, as they provided a rich source for loot. On such raids the Vikings set up impermanent camps, which were called longphorts by the Irish—this period of Viking raids on the coasts of Ireland has been named the longphort phase after these types of settlements. Ireland in the 9th century was organised into an amalgam of small kingdoms, called tuatha; these kingdoms were sometimes ruled by a single, provincial ruler. If such a ruler could establish and maintain authority over a portion of these tuatha, he was sometimes granted the title of High King. Scotland experienced significant Viking incursions during the 9th century; the Vikings established themselves in coastal regions in northern Scotland, in the northern islands such as Orkney and Shetland.
The Viking invasion and settlement in Scotland provided a contributing factor in the collapse of the kingdoms of the Picts, who inhabited most of Scotland at the time. Not only were the Pictish realms either destroyed or weakened, the Viking invasion and settlement may have been the reason for the movement of Kenneth MacAlpin, the king of Dál Riata at that time; the kingdom of Dál Riata was located on the western coast of Scotland, Viking incursions destroyed it after the death of its previous king, Áed mac Boanta in 839, according to the Annals of Ulster. This may have caused the new king, MacAlpin, to move to the east, conquer the remnants of the Pictish realms. MacAlpin became king of the Picts in 843 and kings would be titled as the King of Alba or King of Scots. Art in the 9th century was dedicated to the Gospel and employed as basic tools of liturgy of the Roman Orthodox Church. Thousands of golden art objects were made: Sacred cups, reliquaries, rosaries, altar pieces, statues of the Virgin and Child or Saints all kept the flame of western art from dying out.
Architecture began to revive to some extent by the 9th century, taking the form of Church facilities of all kinds, the first castle fortifications since Roman times began to take form in simple "moat and bailey" castles, or simple "strong point" tower structures, with little refinement. 9th - 13th century - El Castillo, Chichen Itza, Mexico, is built. Itza culture. An unknown event causes the decline of the Maya Classical Era. Beowulf might have been written down in this century. Reign of Charlemagne, concurrent Carolingian Renaissance in Western Europe. Large-scale Viking attacks on Europe begin, devastating countless numbers of people. Oseberg ship burial; the Magyars begin their conquest of Pannonia, a process that will take several decades to be completed. The Tukolor settle in the Senegal river valley. Muslim traders settle in the southeast of Madagascar. 800: Charlemagne is crowned emperor of Rome by Pope Leo III. 800: Charlemagne expands the Frankish state and founds the Carolingian Empire.
He rules over the empire for 14 years. 800: An Arab fleet sails up the Tiber. 800 – 909: Rule of Aghlabids as an independent Muslim dynasty in North Africa, with their capital at Tunis. 802: Jayavarman II of the Khmer people in Cambodia founds the Khmer empire and establishes the Angkorian dynasty. 803: Construction on t
The traditional China calendar, or Former Calendar, Traditional Calendar or Lunar Calendar, is a lunisolar calendar which reckons years and days according to astronomical phenomena. It is defined by GB/T 33661-2017, "Calculation and promulgation of the Chinese calendar", issued by the Standardisation Administration of China on 12 May 2017. Although modern day China uses the Gregorian calendar, the traditional Chinese calendar governs holidays in China and in overseas Chinese communities, it lists the dates of traditional Chinese holidays and guides people in selecting auspicious days for weddings, moving, or starting a business. Like Chinese characters, variants of this calendar are used in different parts of the Chinese cultural sphere. Korea and the Ryukyu Islands adopted the calendar, it evolved into Korean and Ryukyuan calendars; the main difference from the traditional Chinese calendar is the use of different meridians, which leads to some astronomical events—and calendar events based on them—falling on different dates.
The traditional Japanese calendar derived from the Chinese calendar, but its official use in Japan was abolished in 1873 as part of reforms after the Meiji Restoration. Calendars in Mongolia and Tibet have absorbed elements of the traditional Chinese calendar, but are not direct descendants of it. Days begin and end at midnight, months begin on the day of the new moon. Years begin on the second new moon after the winter solstice. Solar terms govern the end of each month. Written versions in ancient China included stems and branches of the year and the names of each month, including leap months as needed. Characters indicated whether a month was short; the traditional Chinese calendar was developed between 771 and 476 BC, during the Spring and Autumn period of the Eastern Zhou dynasty. Before the Zhou dynasty, solar calendars were used. One version of the solar calendar is the five-elements calendar. A 365-day year was divided into five phases of 73 days, with each phase corresponding to a Day 1 Wu Xing element.
A phase began followed by six 12-day weeks. Each phase consisted of two three-week months. Years began followed by a bǐngzǐ day and a 72-day fire phase. Other days were tracked using the Yellow River Map. Another version is a four-quarters calendar. Weeks were ten days long, with one month consisting of three weeks. A year had 12 months, with a ten-day week intercalated in summer as needed to keep up with the tropical year; the 10 Heavenly Stems and 12 Earthly Branches were used to mark days. A third version is the balanced calendar. A year was 365.25 days, a month was 29.5 days. After every 16th month, a half-month was intercalated. According to oracle bone records, the Shang dynasty calendar was a balanced calendar with 12 to 14 months in a year; the first lunisolar calendar was the Zhou calendar, introduced under the Zhou dynasty. This calendar set the beginning of the year at the day of the new moon before the winter solstice, it set the shàngyuán as the winter solstice of a dīngsì year, making the year it was introduced around 2,758,130.
Several competing lunisolar calendars were introduced by states fighting Zhou control during the Warring States period. The state of Lu issued its own Lu calendar. Jin issued the Xia calendar in AD 102, with a year beginning on the day of the new moon nearest the March equinox. Qin issued the Zhuanxu calendar, with a year beginning on the day of the new moon nearest the winter solstice. Song's Yin calendar began its year on the day of the new moon after the winter solstice; these calendars are known as the six ancient calendars, or quarter-remainder calendars, since all calculate a year as 365 1⁄4 days long. Months begin on the day of the new moon, a year has 12 or 13 months. Intercalary months are added to the end of the year; the Qiang and Dai calendars are modern versions of the Zhuanxu calendar, used by mountain peoples. After Qin Shi Huang unified China under the Qin dynasty in 221 BC, the Qin calendar was introduced, it followed most of the rules governing the Zhuanxu calendar, but the month order was that of the Xia calendar.
The intercalary month, known as the second Jiǔyuè, was placed at the end of the year. The Qin calendar was used into the Han dynasty. Emperor Wu of Han r. 141 – 87 BC introduced reforms halfway through his reign. His Taichu Calendar defined a solar year as 365 385⁄1539 days, the lunar month was 29 43⁄81 days; this calendar introduced the 24 solar terms. Solar terms were paired, with the 12 combined periods known as climate terms; the first solar term of the period was known as a pre-climate, the second was a mid-climate. Months were named for the mid-climat
The Islamic, Muslim, or Hijri calendar is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the pilgrimage to Mecca; the civil calendar of all countries where the religion is predominantly Muslim is the Gregorian calendar. Notable exceptions to this rule are Afghanistan, which use the Solar Hijri calendar. Rents and similar regular commitments are paid by the civil calendar; the Islamic calendar employs the Hijri era whose epoch was established as the Islamic New Year of 622 AD/CE. During that year and his followers migrated from Mecca to Yathrib and established the first Muslim community, an event commemorated as the Hijra. In the West, dates in this era are denoted AH in parallel with the Christian and Jewish eras. In Muslim countries, it is sometimes denoted as H from its Arabic form. In English, years prior to the Hijra are reckoned as BH.
The current Islamic year is 1440 AH. In the Gregorian calendar, 1440 AH runs from 11 September 2018 to 30 August 2019. For central Arabia Mecca, there is a lack of epigraphical evidence but details are found in the writings of Muslim authors of the Abbasid era. Inscriptions of the ancient South Arabian calendars reveal the use of a number of local calendars. At least some of these South Arabian calendars followed the lunisolar system. Both al-Biruni and al-Mas'udi suggest that the ancient Arabs used the same month names as the Muslims, though they record other month names used by the pre-Islamic Arabs; the Islamic tradition is unanimous in stating that Arabs of Tihamah and Najd distinguished between two types of months and forbidden months. The forbidden months were four months during which fighting is forbidden, listed as Rajab and the three months around the pilgrimage season, Dhu al-Qa‘dah, Dhu al-Hijjah, Muharram. Information about the forbidden months is found in the writings of Procopius, where he describes an armistice with the Eastern Arabs of the Lakhmid al-Mundhir which happened in the summer of 541 AD/CE.
However, Muslim historians do not link these months to a particular season. The Qur'an links the four forbidden months with Nasī’, a word that means "postponement". According to Muslim tradition, the decision of postponement was administered by the tribe of Kinanah, by a man known as the al-Qalammas of Kinanah and his descendants. Different interpretations of the concept of Nasī’ have been proposed; some scholars, both Muslim and Western, maintain that the pre-Islamic calendar used in central Arabia was a purely lunar calendar similar to the modern Islamic calendar. According to this view, Nasī’ is related to the pre-Islamic practices of the Meccan Arabs, where they would alter the distribution of the forbidden months within a given year without implying a calendar manipulation; this interpretation is supported by Arab historians and lexicographers, like Ibn Hisham, Ibn Manzur, the corpus of Qur'anic exegesis. This is corroborated by an early Sabaic inscription, where a religious ritual was "postponed" due to war.
According to the context of this inscription, the verb ns'’ has nothing to do with intercalation, but only with moving religious events within the calendar itself. The similarity between the religious concept of this ancient inscription and the Qur'an suggests that non-calendaring postponement is the Qur'anic meaning of Nasī’; the Encyclopaedia of Islam concludes "The Arabic system of can only have been intended to move the Hajj and the fairs associated with it in the vicinity of Mecca to a suitable season of the year. It was not intended to establish a fixed calendar to be observed." The term "fixed calendar" is understood to refer to the non-intercalated calendar. Others concur that it was a lunar calendar, but suggest that about 200 years before the Hijra it was transformed into a lunisolar calendar containing an intercalary month added from time to time to keep the pilgrimage within the season of the year when merchandise was most abundant; this interpretation was first proposed by the medieval Muslim astrologer and astronomer Abu Ma'shar al-Balkhi, by al-Biruni, al-Mas'udi, some western scholars.
This interpretation considers Nasī’ to be a synonym to the Arabic word for "intercalation". The Arabs, according to one explanation mentioned by Abu Ma'shar, learned of this type of intercalation from the Jews; the Jewish Nasi was the official. Some sources say that the Arabs followed the Jewish practice and intercalated seven months over nineteen years, or else that they intercalated nine months over 24 years. Postponement of one ritual in a particular circumstance does not imply alteration of the sequence of months, scholars agree that this did not happen. Al-Biruni says this did not happen, the festivals were kept within their season by intercalation every second or third year of a month between Dhu al-Hijjah and Muharram, he says that, in terms of the fixed calendar, not introduced until 10 AH, the first intercalation was, for example, of a month between Dhu al-Hijjah and Muharram, the second of a month between Muharram and Safar, the third of a month between Safar and Rabi'I, so on. The intercalations were arranged.
The notice of interca