A sultan is an Islamic monarch ruling under the terms of shariah. The title carries moral weight and religious authority, as the ruler's role was defined in the Quran The sultan however was not a religious teacher himself. In the Byzantine Empire and the traditional spheres of Eastern Orthodox Christianity, a comparable unity of church and state in the person of the ruler is termed Caesaropapism. The last Western ruler with comparable authority was Nicholas II, the last Tsar of Russia.

The first to carry the title of 'Sultan' was the Turkmen chief Mahmud of Gazna (ruled 998 - 1030). Later, 'Sultan' became the usual title of rulers of Seljuk and Ottoman Turks and Ayyubid and Mamluk rulers in Egypt. The spiritual validation of the title was well illustrated by the fact that it was the shadow caliph in Cairo that bestowed the title "sultan" on the fourth leader of the Ottomans. The earlier leaders had been beys.

At later stages, lesser rulers assumed the styling "sultan", as was the case for the earlier leaders of today's royal family of Morocco. Today, only the Sultan of Oman, the Sultan of Brunei, and some titular sultans in the southern Philippines and in the former Malay States (Malaysia) still use the title. The sultan's domain is properly called a Sultanate. A feminine form, used by Westerners, is sultana; the very styling misconstrues the roles of wives of sultans. In a similar usage, the wife of a German Field-Marshal might be styled ' Feldmarschallin '.

Among those modern heriditary rulers who wish to emphasize their secular authority under the rule of law, the term is gradually being replaced by 'king'.

See also: Bey, Caliph, Emir, Khan and Shah.

Former Sultans and Sultanates

Seljuk Sultans of Korasan
Seljuk Sultans of Rum
Seljuk Sultans of Iconium
Sultans of the Ottoman Empire
Ayyubid Sultans of Damascus
Ayyubid Sultans of Egypt
Mamluk Sultans of Egypt
Sultans of Maguindanao, Philippines
Sultanate of Delhi
Sultanate of Mysore see also Tippu Sultan
Qu'aiti and Kathiri sultans in the Hadhramaut
Sultans of Nejd in Arabia
Sultans of the Hejaz in Arabia

Contemporary Sultans
Saudi Arabia (The Saudi Sultan wishes to be styled "king" in foreign countries).
Malaysia (On a rotating basis)