United States dollar
The United States dollar is the official currency of the United States and its territories per the United States Constitution since 1792. In practice, the dollar is divided into 100 smaller cent units, but is divided into 1000 mills for accounting; the circulating paper money consists of Federal Reserve Notes that are denominated in United States dollars. Since the suspension in 1971 of convertibility of paper U. S. currency into any precious metal, the U. S. dollar is, de facto, fiat money. As it is the most used in international transactions, the U. S. dollar is the world's primary reserve currency. Several countries use it as their official currency, in many others it is the de facto currency. Besides the United States, it is used as the sole currency in two British Overseas Territories in the Caribbean: the British Virgin Islands and Turks and Caicos Islands. A few countries use the Federal Reserve Notes for paper money, while still minting their own coins, or accept U. S. dollar coins. As of June 27, 2018, there are $1.67 trillion in circulation, of which $1.62 trillion is in Federal Reserve notes.
Article I, Section 8 of the U. S. Constitution provides that the Congress has the power "To coin money". Laws implementing this power are codified at 31 U. S. C. § 5112. Section 5112 prescribes the forms; these coins are both designated in Section 5112 as "legal tender" in payment of debts. The Sacagawea dollar is one example of the copper alloy dollar; the pure silver dollar is known as the American Silver Eagle. Section 5112 provides for the minting and issuance of other coins, which have values ranging from one cent to 100 dollars; these other coins are more described in Coins of the United States dollar. The Constitution provides that "a regular Statement and Account of the Receipts and Expenditures of all public Money shall be published from time to time"; that provision of the Constitution is made specific by Section 331 of Title 31 of the United States Code. The sums of money reported in the "Statements" are being expressed in U. S. dollars. The U. S. dollar may therefore be described as the unit of account of the United States.
The word "dollar" is one of the words in the first paragraph of Section 9 of Article I of the Constitution. There, "dollars" is a reference to the Spanish milled dollar, a coin that had a monetary value of 8 Spanish units of currency, or reales. In 1792 the U. S. Congress passed a Coinage Act. Section 9 of that act authorized the production of various coins, including "DOLLARS OR UNITS—each to be of the value of a Spanish milled dollar as the same is now current, to contain three hundred and seventy-one grains and four sixteenth parts of a grain of pure, or four hundred and sixteen grains of standard silver". Section 20 of the act provided, "That the money of account of the United States shall be expressed in dollars, or units... and that all accounts in the public offices and all proceedings in the courts of the United States shall be kept and had in conformity to this regulation". In other words, this act designated the United States dollar as the unit of currency of the United States. Unlike the Spanish milled dollar, the U.
S. dollar is based upon a decimal system of values. In addition to the dollar the coinage act established monetary units of mill or one-thousandth of a dollar, cent or one-hundredth of a dollar, dime or one-tenth of a dollar, eagle or ten dollars, with prescribed weights and composition of gold, silver, or copper for each, it was proposed in the mid-1800s that one hundred dollars be known as a union, but no union coins were struck and only patterns for the $50 half union exist. However, only cents are in everyday use as divisions of the dollar. XX9 per gallon, e.g. $3.599, more written as $3.599⁄10. When issued in circulating form, denominations equal to or less than a dollar are emitted as U. S. coins while denominations equal to or greater than a dollar are emitted as Federal Reserve notes. Both one-dollar coins and notes are produced today, although the note form is more common. In the past, "paper money" was issued in denominations less than a dollar and gold coins were issued for circulation up to the value of $20.
The term eagle was used in the Coinage Act of 1792 for the denomination of ten dollars, subsequently was used in naming gold coins. Paper currency less than one dollar in denomination, known as "fractional currency", was sometimes pejoratively referred to as "shinplasters". In 1854, James Guthrie Secretary of the Treasury, proposed creating $100, $50 and $25 gold coins, which were referred to as a "Union", "Half Union", "Quarter Union", thus implying a denomination of 1 Union = $100. Today, USD notes are made from cotton fiber paper, unlike most common paper, made of wood fiber. U. S. coins are produced by the United States Mint. U. S. dollar banknotes are printed by the Bureau of Engraving and Printing and, since 1914, have been issued by t
Mahindra & Mahindra
Mahindra & Mahindra Limited is an Indian multinational car manufacturing corporation headquartered in Mumbai, India. It was established in 1945 as Mohammad & Mahindra and renamed as Mahindra and Mahindra, it is one of the largest vehicle manufacturers by production in India and the largest manufacturer of tractors in the world. It is a part of an Indian conglomerate, it was ranked 17th on a list of top companies in India by Fortune India 500 in 2018. Its major competitors in the Indian market include Tata Motors. Mahindra & Mahindra was set up as a steel trading company in 1945 in Ludhiana as Mahindra & Mohmmed by brothers Kailash Chandra Mahindra and Jagdish Chandra Mahindra along with Malik Ghulam Mohammed. Anand Mahindra, the present Chairman of Mahindra Group is the grand-son of Jagdish Chandra Mahindra. After India gained independence and Pakistan was formed, Mohammed emigrated to Pakistan where he became that country's first finance minister; the company changed its name to Mahindra & Mahindra in 1948.
It saw a business opportunity in expanding into manufacturing and selling larger MUVs, starting with the assembly under licence of the Willys Jeep in India. Soon established as the Jeep manufacturers of India, the company commenced manufacturing light commercial vehicles and agricultural tractors. Over the past few years, the company has taken interest in foreign markets, they entered the two-wheeler industry by taking over Kinetic Motors in India. M&M has a controlling stake in the REVA Electric Car Company and acquired South Korea's SsangYong Motor Company in 2011. In 2010–11 M&M entered in micro drip irrigation with the takeover of EPC Industries Ltd in Nashik. In October 2014, Mahindra and Mahindra acquired a 51% controlling stake in Peugeot Motocycles. In December 2015, Mahindra and Mahindra Ltd and affiliate Tech Mahindra Ltd, through a special purpose vehicle, have agreed to buy a 76.06% stake in Italian car designer Pininfarina SpA, for €25.3 million. In January 2017, Mahindra and Mahindra Ltd acquired a 75.1 equity stake in Hisarlar Makina Sanayi ve Ticaret Anonim Şirketi, a farm equipment company, marking its entry into Turkey.
In September 2017 Mahindra and Mahindra Ltd acquired Erkunt Traktor Sanayii AS, a Turkish tractor maker and its foundry business for ₹800 crore. Mahindra & Mahindra, brands its products as "Mahindra", produces SUVs, saloon cars, lightweight commercial vehicles, heavyweight commercial vehicles, two wheeled motorcycles and tractors. Mahindra maintains business relations with foreign companies like France. M&M has a global presence and its products are exported to several countries, its global subsidiaries include Mahindra Europe S.r.l. based in Mahindra USA Inc.. Mahindra South Africa and Mahindra Tractor Co. Ltd. In 2015, Mahindra reentered the Philippine market after a brief presence in 1990sMahindra began assembling the Jeep CJ3 in 1954, light commercial vehicles in 1965. In 1979 the licensed assembly of Peugeot diesel four-cylinder engines and transmissions began, in 1982 a tie-up with Kia Motors to build their four-speed KMT90 transmission and transfer case was announced. Mahindra's MM range was a mainstay of the lineup and was also offered with a 1.8-liter Isuzu petrol engine in addition to International and Peugeot diesels.
Mahindra started making passenger vehicles firstly with the Logan in April 2007 under the Mahindra Renault joint venture. M&M made its maiden entry into the heavy trucks segment with the Mahindra Truck and Bus Division, the joint venture with International Truck, USA. Mahindra produces a wide range including MUVs, LCVs and three-wheelers, it manufactures over 20 models of cars, including larger, multi-utility vehicles like the Scorpio and the Bolero. It had a joint venture with Ford called Ford India Private Limited to build passenger cars. At the 2008 Delhi Auto Show, Mahindra executives said the company was pursuing an aggressive product expansion program that would see the launch of several new platforms and vehicles over the next three years, including an entry-level SUV designed to seat five passengers and powered by a small, turbocharged Diesel engine. True to their word, Mahindra & Mahindra launched the Mahindra Xylo in January 2009, selling over 15,000 units in its first six months. In early 2008, Mahindra commenced its first overseas CKD operations with the launch of the Mahindra Scorpio in Egypt, in partnership with the Bavarian Auto Group.
This was soon followed by assembly facilities in Brazil. Vehicles assembled at the plant in Bramont, include Scorpio Pik Ups in single and double cab pick-up body styles as well as SUVs. Mahindra planned to sell the diesel SUVs and pickup trucks starting in late 2010 in North America through an independent distributor, Global Vehicles USA, based in Alpharetta, Georgia. Mahindra announced it would import pickup trucks from India in knockdown kit form to circumvent the Chicken tax. CKDs are complete vehicles that were assembled in the United States from kits of parts shipped in crates. On 18 October 2010, however, it was reported that Mahindra had indefinitely delayed the launch of vehicles into the North American market, citing legal issues between it and Global Vehicles after Mahindra retracted its contract with Global Vehicles earlier in 2010, due to a decision to sell the vehicles directly to consumers instead of through Global Vehicles. However, a November 2010 report quoted John Perez, the CEO of Global Vehicles USA, as estimating that he expected Mahindra's small Diesel pickups to go on sale in the United States by spring 2011, although legal complications remained, Perez, while hopeful, admitted that arbitration could take more
Mumbai is the capital city of the Indian state of Maharashtra. As of 2011 it is the most populous city in India with an estimated city proper population of 12.4 million. The larger Mumbai Metropolitan Region is the second most populous metropolitan area in India, with a population of 21.3 million as of 2016. Mumbai has a deep natural harbour. In 2008, Mumbai was named an alpha world city, it is the wealthiest city in India, has the highest number of millionaires and billionaires among all cities in India. Mumbai is home to three UNESCO World Heritage Sites: the Elephanta Caves, Chhatrapati Shivaji Maharaj Terminus, the city's distinctive ensemble of Victorian and Art Deco buildings; the seven islands that constitute Mumbai were home to communities of Koli people, who originated in Gujarat in prehistoric times. For centuries, the islands were under the control of successive indigenous empires before being ceded to the Portuguese Empire and subsequently to the East India Company when in 1661 Charles II of England married Catherine of Braganza and as part of her dowry Charles received the ports of Tangier and Seven Islands of Bombay.
During the mid-18th century, Bombay was reshaped by the Hornby Vellard project, which undertook reclamation of the area between the seven islands from the sea. Along with construction of major roads and railways, the reclamation project, completed in 1845, transformed Bombay into a major seaport on the Arabian Sea. Bombay in the 19th century was characterised by educational development. During the early 20th century it became a strong base for the Indian independence movement. Upon India's independence in 1947 the city was incorporated into Bombay State. In 1960, following the Samyukta Maharashtra Movement, a new state of Maharashtra was created with Bombay as the capital. Mumbai is the financial and entertainment capital of India, it is one of the world's top ten centres of commerce in terms of global financial flow, generating 6.16% of India's GDP and accounting for 25% of industrial output, 70% of maritime trade in India, 70% of capital transactions to India's economy. The city houses important financial institutions such as the Reserve Bank of India, the Bombay Stock Exchange, the National Stock Exchange of India, the SEBI and the corporate headquarters of numerous Indian companies and multinational corporations.
It is home to some of India's premier scientific and nuclear institutes like Bhabha Atomic Research Centre, Nuclear Power Corporation of India, Indian Rare Earths, Tata Institute of Fundamental Research, Atomic Energy Regulatory Board, Atomic Energy Commission of India, the Department of Atomic Energy. The city houses India's Hindi and Marathi cinema industries. Mumbai's business opportunities, as well as its potential to offer a higher standard of living, attract migrants from all over India, making the city a melting pot of many communities and cultures; the name Mumbai is derived from Mumbā or Mahā-Ambā—the name of the patron goddess Mumbadevi of the native Koli community— and ā'ī meaning "mother" in the Marathi language, the mother tongue of the Koli people and the official language of Maharashtra. The Koli people originated in Kathiawad and Central Gujarat, according to some sources they brought their goddess Mumba with them from Kathiawad, where she is still worshipped. However, other sources disagree.
The oldest known names for the city are Galajunkja. In 1508, Portuguese writer Gaspar Correia used the name "Bombaim" in his Lendas da Índia; this name originated as the Galician-Portuguese phrase bom baim, meaning "good little bay", Bombaim is still used in Portuguese. In 1516, Portuguese explorer Duarte Barbosa used the name Tana-Maiambu: Tana appears to refer to the adjoining town of Thane and Maiambu to Mumbadevi. Other variations recorded in the 16th and the 17th centuries include: Mombayn, Bombain, Monbaym, Mombaym, Bombaiim, Boon Bay, Bon Bahia. After the English gained possession of the city in the 17th century, the Portuguese name was anglicised as Bombay. Ali Muhammad Khan, imperial dewan or revenue minister of the Gujarat province, in the Mirat-i Ahmedi referred to the city as Manbai; the French traveller Louis Rousselet who visited in 1863 and 1868 tells us in his book L’Inde des Rajahs: "Etymologists have wrongly derived this name from the Portuguese Bôa Bahia, or, not knowing that the tutelar goddess of this island has been, from remote antiquity, Bomba, or Mamba Dévi, that she still... possesses a temple".
By the late 20th century, the city was referred to as Mumbai or Mambai in Marathi, Gujarati and Sindhi, as Bambai in Hindi. The Government of India changed the English name to Mumbai in November 1995; this came at the insistence of the Marathi nationalist Shiv Sena party, which had just won the Maharashtra state elections, mirrored similar name changes across the country and in Maharashtra. According to Slate magazine, "they argued that'Bombay' was a corrupted English version of'Mumbai' and an unwanted legacy of British colonial rule." Slate said "The push to rename Bombay was part of a larger movement to strengthen Marathi identity in the Maharashtra region." While the city is still referred to as Bombay by some of its residents and by Indians from other regions, mention of the ci
Maharashtra is a state in the western peninsular region of India occupying a substantial portion of the Deccan plateau. It is third-largest state by area in India. Spread over 307,713 km2, it is bordered by the Arabian Sea to the west, the Indian states of Karnataka and Goa to the south and Chhattisgarh to the east and Dadra and Nagar Haveli to the north west, Madhya Pradesh to the north, it is the world's second-most populous subnational entity. It was formed by merging the western and south-western parts of the Bombay State and Vidarbha, the north-western parts of the Hyderabad State and splitting Saurashtra by the States Reorganisation Act, it has over 112 million inhabitants and its capital, has a population around 18 million making it the most populous urban area in India. Nagpur hosts the winter session of the state legislature. Pune is known as'Oxford of the East' due to the presence of several well-known educational institutions; the Godavari and the Krishna are the two major rivers in the state.
The Narmada and Tapi Rivers flow near Madhya Pradesh and Gujarat. Maharashtra is the third-most urbanized state of India. Prior to Indian independence, Maharashtra was chronologically ruled by the Satavahana dynasty, Rashtrakuta dynasty, Western Chalukyas, Deccan sultanates and Marathas, the British. Ruins, tombs and places of worship left by these rulers are dotted around the state, they include the UNESCO World Heritage Sites of the Ellora caves. The numerous forts are associated with the life of Chhatrapati Shivaji Maharaj. Maharashtra is the wealthiest state by all major economic parameters and the most industrialized state in India; the state continues to be the single largest contributor to the national economy with a share of 15% in the country's gross domestic product. Maharashtra accounts for 17% of the industrial output of the country and 16% of the country's service sector output; the economy of Maharashtra is the largest state economy in India with ₹27.96 lakh crore in GDP and a per capita GDP of ₹180,000.
The modern Marathi language developed from the Maharashtri Prakrit, the word Marhatta is found in the Jain Maharashtri literature. The terms Maharashtra, Maharashtri and Maratha may have derived from the same root. However, their exact etymology is uncertain; the most accepted theory among the linguistic scholars is that the words Maratha and Maharashtra derived from a combination of Maha and rashtrika, the name of a tribe or dynasty of petty chiefs ruling in the Deccan region. Another theory is that the term is derived from Maha and ratha / rathi, which refers to a skilful northern fighting force that migrated southward into the area. An alternative theory states that the term derives from Rashtra. However, this theory is somewhat controversial among modern scholars who believe it to be the Sanskritised interpretation of writers. Chalcolithic sites belonging to the Jorwe culture have been discovered throughout the state. Maharashtra was ruled by the Maurya Empire in the fourth and third centuries BCE.
Around 230 BCE, Maharashtra came under the rule of the Satavahana dynasty for 400 years. The greatest ruler of the Satavahana dynasty was Gautamiputra Satakarni. In 90 CE, son of the Satavahana king Satakarni, the "Lord of Dakshinapatha, wielder of the unchecked wheel of Sovereignty", made Junnar, 30 miles north of Pune, the capital of his kingdom; the state was ruled by Western Satraps, Gupta Empire, Gurjara-Pratihara, Kadambas, Chalukya Empire, Rashtrakuta Dynasty, Western Chalukya before the Yadava rule. The Buddhist Ajanta Caves in present-day Aurangabad display influences from the Satavahana and Vakataka style; the caves were excavated during this period. The Chalukya dynasty ruled from the sixth to the eighth centuries CE, the two prominent rulers were Pulakeshin II, who defeated the north Indian Emperor Harsha, Vikramaditya II, who defeated the Arab invaders in the eighth century; the Rashtrakuta dynasty ruled Maharashtra from the eighth to the tenth century. The Arab traveller Sulaiman described the ruler of the Rashtrakuta Dynasty as "one of the four great kings of the world".
Shilahara dynasty began as vassals of the Rashtrakuta dynasty which ruled the Deccan plateau between the eighth and tenth centuries. From the early 11th century to the 12th century, the Deccan Plateau, which includes a significant part of Maharashtra, was dominated by the Western Chalukya Empire and the Chola dynasty. Several battles were fought between the Western Chalukya empire and the Chola dynasty in the Deccan Plateau during the reigns of Raja Raja Chola I, Rajendra Chola I, Jayasimha II, Someshvara I, Vikramaditya VI. In the early 14th century, the Yadava Dynasty, which ruled most of present-day Maharashtra, was overthrown by the Delhi Sultanate ruler Ala-ud-din Khalji. Muhammad bin Tughluq conquered parts of the Deccan, temporarily shifted his capital from Delhi to Daulatabad in Maharashtra. After the collapse of the Tughluqs in 1347, the local Bahmani Sultanate of Gulbarga took over, governing the region for the next 150 years. After the break-up of the Bahamani sultanate in 1518, Maharashtra split into five Deccan Sultanates: Nizamshah of Ahmednagar, Adilshah of Bijapur, Qutubshah of Golkonda, Bidarshah of Bidar and Imadshah of Elichpur.
These kingdoms fought with each other. United, they decisively defeated the
Amateur radio known as ham radio, describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport and emergency communication. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest; the amateur radio service is established by the International Telecommunication Union through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual stations licenses with an identifying call sign. Prospective amateur operators are tested for their understanding of key concepts in electronics and the host government's radio regulations. Radio amateurs use a variety of voice, text and data communications modes and have access to frequency allocations throughout the RF spectrum; this enables communication across a city, country, the world, or into space.
In many countries, amateur radio operators may send, receive, or relay radio communications between computers or transceivers connected to secure virtual private networks on the Internet. Amateur radio is represented and coordinated by the International Amateur Radio Union, organized in three regions and has as its members the national amateur radio societies which exist in most countries. According to an estimate made in 2011 by the American Radio Relay League, two million people throughout the world are involved with amateur radio. About 830,000 amateur radio stations are located in IARU Region 2 followed by IARU Region 3 with about 750,000 stations. A smaller number, about 400,000, are located in IARU Region 1; the origins of amateur radio can be traced to the late 19th century, but amateur radio as practiced today began in the early 20th century. The First Annual Official Wireless Blue Book of the Wireless Association of America, produced in 1909, contains a list of amateur radio stations.
This radio callbook lists wireless telegraph stations in Canada and the United States, including 89 amateur radio stations. As with radio in general, amateur radio was associated with various amateur experimenters and hobbyists. Amateur radio enthusiasts have contributed to science, engineering and social services. Research by amateur operators has founded new industries, built economies, empowered nations, saved lives in times of emergency. Ham radio can be used in the classroom to teach English, map skills, math and computer skills; the term "ham" was first a pejorative term used in professional wired telegraphy during the 19th century, to mock operators with poor Morse code sending skills. This term continued to be used after the invention of radio and the proliferation of amateur experimentation with wireless telegraphy; the use of "ham" meaning "amateurish or unskilled" survives today in other disciplines. The amateur radio community subsequently began to reclaim the word as a label of pride, by the mid-20th century it had lost its pejorative meaning.
Although not an acronym, it is mistakenly written as "HAM" in capital letters. The many facets of amateur radio attract practitioners with a wide range of interests. Many amateurs begin with a fascination of radio communication and combine other personal interests to make pursuit of the hobby rewarding; some of the focal areas amateurs pursue include radio contesting, radio propagation study, public service communication, technical experimentation, computer networking. Amateur radio operators use various modes of transmission to communicate; the two most common modes for voice transmissions are single sideband. FM offers high quality audio signals, while SSB is better at long distance communication when bandwidth is restricted. Radiotelegraphy using Morse code known as "CW" from "continuous wave", is the wireless extension of landline telegraphy developed by Samuel Morse and dates to the earliest days of radio. Although computer-based modes and methods have replaced CW for commercial and military applications, many amateur radio operators still enjoy using the CW mode—particularly on the shortwave bands and for experimental work, such as earth-moon-earth communication, because of its inherent signal-to-noise ratio advantages.
Morse, using internationally agreed message encodings such as the Q code, enables communication between amateurs who speak different languages. It is popular with homebrewers and in particular with "QRP" or very-low-power enthusiasts, as CW-only transmitters are simpler to construct, the human ear-brain signal processing system can pull weak CW signals out of the noise where voice signals would be inaudible. A similar "legacy" mode popular with home constructors is amplitude modulation, pursued by many vintage amateur radio enthusiasts and aficionados of vacuum tube technology. Demonstrating a proficiency in Morse code was for many years a requirement to obtain an amateur license to transmit on frequencies below 30 MHz. Following changes in international regulations in 2003, countries are no longer required to demand proficiency; the United States Federal
Hyderabad is the capital of the Indian state of Telangana and de jure capital of Andhra Pradesh. Occupying 650 square kilometres along the banks of the Musi River, Hyderabad City has a population of about 6.9 million and about 9.7 million in Hyderabad Metropolitan Region, making it the fourth most populous city and sixth most populous urban agglomeration in India. At an average altitude of 542 metres, much of Hyderabad is situated on hilly terrain around artificial lakes, including Hussain Sagar—predating the city's founding—north of the city centre. Established in 1591 by Muhammad Quli Qutb Shah, Hyderabad remained under the rule of the Qutb Shahi dynasty for nearly a century before the Mughals captured the region. In 1724, Mughal viceroy Asif Jah I declared his sovereignty and created his own dynasty, known as the Nizams of Hyderabad; the Nizam's dominions became a princely state during the British Raj, remained so for 150 years, with the city serving as its capital. The city continued as the capital of Hyderabad State after it was brought into the Indian Union in 1948, became the capital of Andhra Pradesh after the States Reorganisation Act, 1956.
Since 1956, Rashtrapati Nilayam in the city has been the winter office of the President of India. In 2014, the newly formed state of Telangana split from Andhra Pradesh and the city became the joint capital of the two states, a transitional arrangement scheduled to end by 2025. Relics of Qutb Shahi and Nizam rule remain visible. Golconda fort is another major landmark; the influence of Mughlai culture is evident in the region's distinctive cuisine, which includes Hyderabadi biryani and Hyderabadi haleem. The Qutb Shahis and Nizams established Hyderabad as a cultural hub, attracting men of letters from different parts of the world. Hyderabad emerged as the foremost centre of culture in India with the decline of the Mughal Empire in the mid-19th century, with artists migrating to the city from the rest of the Indian subcontinent; the Telugu film industry based in the city is the country's second-largest producer of motion pictures. Hyderabad was known as a pearl and diamond trading centre, it continues to be known as the "City of Pearls".
Many of the city's traditional bazaars remain open, including Laad Bazaar, Begum Bazaar and Sultan Bazaar. Industrialisation throughout the 20th century attracted major Indian research and financial institutions, including Defence Research and Development Organization, Bharat Heavy Electricals Limited, Indian Institute of Chemical Technology, the National Geophysical Research Institute and the Centre for Cellular and Molecular Biology. Special economic zones dedicated to information technology have encouraged companies from India and around the world to set up operations in Hyderabad; the emergence of pharmaceutical and biotechnology industries in the 1990s led to the area's naming as India's "Genome Valley". With an output of US$74 billion, Hyderabad is the fifth-largest contributor to India's overall gross domestic product. According to John Everett-Heath, the author of Oxford Concise Dictionary of World Place Names, Hyderabad means "Haydar's city" or "lion city", from haydar and ābād, was named to honour the Caliph Ali Ibn Abi Talib, known as Haydar because of his lion-like valour in battles.
Andrew Petersen, a scholar of Islamic architecture, says the city was called Baghnagar. One popular theory suggests that the founder of the city, Muhammad Quli Qutb Shah of the Golconda Sultanate, named it after Bhagmati, a local nautch girl with whom he had fallen in love, she adopted the title Hyder Mahal. The city was named as Hyderabad in her honour. According to German traveller Heinrich von Poser, whose travelogue of the Deccan was translated by Gita Dharampal-Frick of Heidelberg University, there were two names for the city: "On 3 December 1622, we reached the city of Bagneger or Hederabat, the seat of the king Sultan Mehemet Culi Cuttub Shah and the capital of the kingdom". French traveller Jean de Thévenot visited the Deccan region in 1666–1667 refers to the city in his book Travels in India as "Bagnagar and Aiderabad". Archaeologists excavating near the city have unearthed Iron Age sites that may date from 500 BCE; the region comprising modern Hyderabad and its surroundings was known as Golkonda, was ruled by the Chalukya dynasty from 624 CE to 1075 CE.
Following the dissolution of the Chalukya empire into four parts in the 11th century, Golkonda came under the control of the Kakatiya dynasty from 1158, whose seat of power was at Warangal, 148 km northeast of modern Hyderabad. The Kakatiya dynasty was reduced to a vassal of the Khalji dynasty in 1310 after its defeat by Sultan Alauddin Khalji of the Delhi Sultanate; this lasted until 1321, when the Kakatiya dynasty was annexed by Malik Kafur, Allaudin Khalji's general. During this period, Alauddin Khalji took the Koh-i-Noor diamond, said to have been mined from the Kollur Mines of Golkonda, to Delhi. Muhammad bin Tughluq succeeded to the Delhi sultanate in 1325, bringing Warangal under the rule of the Tughlaq dynasty until 1347 when Ala-ud-Din Bahman Shah, a governor under bin Tughluq, rebelled against Delhi and established the Bahmani Sultanate in the Deccan Plateau, with Gulbarga, 200 km west of Hyderabad, as its capital; the Hyderabad area was under the control of the Musunuri Nayaks at this time, however, were forced to cede it to the Bahmani Sultanate in 1364.
The Bahmani kings ruled the region until 1518 and were the first independent Muslim rulers of the Deccan. Sultan Quli, a governor of Golkonda, revolted against the Bah