Sultan of the Ottoman Empire in the context of "Abdulaziz"

Mehmed II (Ottoman Turkish: محمد ثانى, romanized: Meḥemmed-i s̱ānī; Turkish: II. Mehmed, pronounced [icinˈdʒi ˈmehmet]; 30 March 1432 – 3 May 1481), commonly known as Mehmed the Conqueror (Ottoman Turkish: ابو الفتح, romanized: Ebū'l-fetḥ, lit. 'the Father of Conquest'; Turkish: Fâtih Sultan Mehmed), was twice the sultan of the Ottoman Empire from August 1444 to September 1446 and then later from February 1451 to May 1481.

In Mehmed II's first reign, he defeated the crusade led by John Hunyadi after the Hungarian incursions into his country broke the conditions of the truce per the Treaties of Edirne and Szeged. When Mehmed II ascended the throne again in 1451, he strengthened the Ottoman Navy and made preparations to attack Constantinople. At the age of 21, he conquered Constantinople and brought an end to the Byzantine Empire. After the conquest, Mehmed claimed the title caesar of Rome (Ottoman Turkish: قیصر روم, romanized: qayṣar-i rūm), based on the fact that Constantinople had been the seat and capital of the surviving Eastern Roman Empire since its consecration in 330 AD by Emperor Constantine I. The claim was soon recognized by the Patriarchate of Constantinople, albeit not by most European monarchs.

Murad II (Ottoman Turkish: مراد ثانى, romanized: Murād-ı sānī, Turkish: II. Murad; June 1404 – 3 February 1451) was twice the sultan of the Ottoman Empire, from 1421 to 1444 and from 1446 to 1451.

Abdul Mejid I (Ottoman Turkish: عبد المجید اول, romanized: ʿAbdü'l-Mecîd, Turkish: I. Abdülmecid; 25 April 1823 – 25 June 1861) was the 31st sultan of the Ottoman Empire. He succeeded his father Mahmud II on 2 July 1839.

Abdulmejid's greatest achievement was the announcement of the Tanzimat Edict upon his accession, prepared by his then Foreign Minister Mustafa Reshid Pasha, which effectively began the Tanzimat era, or era of reorganization, in the Ottoman Empire. He was a mild-mannered monarch, giving the Sublime Porte the autonomy needed for its reform projects. One of the main goals of the Tanzimat was to encourage Ottomanism among the millets to stop rising nationalist movements within the empire, but despite new laws and reforms to integrate non-Muslims and non-Turks more thoroughly into Ottoman society, in the long term, the movement failed.

Selim III (Ottoman Turkish: سليم ثالث, romanized: Selim-i sâlis; Turkish: III. Selim; 24 December 1761 – 28 July 1808) was the sultan of the Ottoman Empire from 1789 to 1807. Regarded as an enlightened ruler, he was eventually deposed and imprisoned by the Janissaries, who placed his cousin Mustafa on the throne as Mustafa IV (r. 1807–1808). A group of assassins subsequently killed Selim.

A vilayet (Ottoman Turkish: ولایت, "province"; [vi.laː.jet]), also known by various other names, was a first-order administrative division of the later Ottoman Empire. It was introduced in the Vilayet Law of 21 January 1867, part of the Tanzimat reform movement initiated by the Ottoman Reform Edict of 1856. The Danube Vilayet had been specially formed in 1864 as an experiment under the leading reformer Midhat Pasha. The Vilayet Law expanded its use, but it was not until 1884 that it was applied to all of the empire's provinces. Writing for the Encyclopaedia Britannica in 1911, Vincent Henry Penalver Caillard claimed that the reform had intended to provide the provinces with greater amounts of local self-government but in fact centralized more power with the sultan and local Muslims at the expense of other communities.

Sultan (/ˈsʌltən/; Arabic: سلطان sulṭān, pronounced [sʊlˈtˤɑːn, solˈtˤɑːn]) is a position with several historical meanings. Originally, it was an Arabic abstract noun meaning "strength", "authority", "rulership", derived from the verbal noun سلطة sulṭah, meaning "authority" or "power". Later, it came to be used as the title of certain rulers who claimed almost full sovereignty (i.e., not having dependence on any higher ruler) without claiming the overall caliphate, or to refer to a powerful governor of a province within the caliphate. The adjectival form of the word is "sultanic", and the state and territories ruled by a sultan, as well as his office, are referred to as a sultanate (سلطنة salṭanah).

The term is distinct from king (ملك malik), though both refer to a sovereign ruler. The use of "sultan" is restricted to Muslim countries, where the title carries religious significance, contrasting with the more secular king, which is used in both Muslim and non-Muslim countries.