Sultan 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 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.
Suleiman the Magnificent, the longest-reigning sultan of the Ottoman Empire
Ottoman Sultan Mehmed IV attended by a eunuch and two pages.
The valide sultan (sultana mother) of the Ottoman Empire
Tuman bay II, last of the Mamluk Sultans.
A caliphate or khilāfah is an institution or public office under the leadership of an Islamic steward with the title of caliph, a person considered a political-religious successor to the Islamic prophet Muhammad and a leader of the entire Muslim world (ummah). Historically, the caliphates were polities based on Islam which developed into multi-ethnic trans-national empires. During the medieval period, three major caliphates succeeded each other: the Rashidun Caliphate (632–661), the Umayyad Caliphate (661–750), and the Abbasid Caliphate (750–1517). In the fourth major caliphate, the Ottoman Caliphate, the rulers of the Ottoman Empire claimed caliphal authority from 1517 until the caliphate was formally abolished as part of the 1924 secularisation of Turkey. Throughout the history of Islam, a few other Muslim states, almost all of which were hereditary monarchies such as the Mamluk Sultanate and Ayyubid Sultanate, have claimed to be caliphates.
Mustansiriya Madrasah in Baghdad
Abdulmejid II, the last caliph of Sunni Islam from the Ottoman dynasty, with his daughter Dürrüşehvar Sultan
Official portrait of Abdulmejid II as caliph
Hafiz Muhiuddin Aurangzeb, unlike his predecessors, was considered to be a caliph of India.