Emir, sometimes transliterated amir, amier, or ameer, is a word of Arabic origin that can refer to a male monarch, aristocrat, holder of high-ranking military or political office, or other person possessing actual or ceremonial authority. The title has a long history of use in the Arab World, East Africa, West Africa, Central Asia, and the Indian subcontinent. In the modern era, when used as a formal monarchical title, it is roughly synonymous with "prince", applicable both to a son of a hereditary monarch, and to a reigning monarch of a sovereign principality, namely an emirate. The feminine form is emira, with the same meaning as "princess". Prior to its use as a monarchical title, the term "emir" was historically used to denote a "commander", "general", or "leader". In contemporary usage, "emir" is also sometimes used as either an honorary or formal title for the head of an Islamic, or Arab organisation or movement.
The court of the Durrani Emirate of Afghanistan in 1839
Emir of Kano, Sanusi Lamido Sanusi
A monarch is a head of state for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority and power in the state, or others may wield that power on behalf of the monarch. Usually a monarch either personally inherits the lawful right to exercise the state's sovereign rights or is selected by an established process from a family or cohort eligible to provide the nation's monarch. Alternatively, an individual may proclaim oneself monarch, which may be backed and legitimated through acclamation, right of conquest or a combination of means.
The Nine Sovereigns at Windsor for the funeral of King Edward VII, photographed on 20 May 1910. Standing, from left to right: King Haakon VII of Norway, Tsar (King) Ferdinand of the Bulgarians, King Manuel II of Portugal and the Algarve, Kaiser (Emperor) Wilhelm II of Germany, King George I of the Hellenes and King Albert I of the Belgians. Seated, from left to right: King Alfonso XIII of Spain, King George V of the United Kingdom and King Frederik VIII of Denmark.
Postcard from 1908 showing nineteen of the world's reigning monarchs: (left to right)King Rama V/Chulalongkorn of Siam (modern Thailand), King George I of Greece, King Peter I of Serbia, King Carol I of Romania, Emperor and King Franz Joseph of Austria-Hungary, Tzar (King) Ferdinand I of Bulgaria, Padishah (Emperor) Abdul Hamid II of the Ottoman Empire, King Victor Emmanuel III of Italy, Emperor Nicholas II of the Russia, King Edward VII of the United Kingdom,
Ramesses II (r. 1279–1213 BC), the third Pharaoh of the Nineteenth Dynasty of Egypt
Mohamoud Ali Shire, the 26th Sultan of the Somali Warsangali Sultanate