ʿIṣmat ad-Dīn Khātūn (Arabic: عصمت الدين خاتون; died 1186), also known as Asimat, was the daughter of Mu'in ad-Din Unur, regent of Damascus, and wife of two of the greatest Muslim generals of the 12th century, Nur ad-Din and Saladin.
Ismat ad-Din is a laqab (the descriptive part of an Arabic name) meaning "purity of the faith"; Khatun is an honorific meaning "lady" or "noblewoman". Her given name (ism in Arabic) is unknown. Her father became regent of Damascus in 1138, and ruled the city on behalf of a series of young emirs of the Burid dynasty. During this time, Damascus' chief rivals to the north, Aleppo and Mosul, were united under the rule of the Zengid dynasty. Damascus had maintained an unsteady alliance with the Crusader Kingdom of Jerusalem, but in 1147, Mu'in ad-Din negotiated an alliance with the Zengid emir of Aleppo, Nur ad-Din, who married Ismat ad-Din as part of the agreement. The next year, forces of Second Crusade conducted the unsuccessful Siege of Damascus, and Mu'in ad-Din was forced to recognize Nur ad-Din, who had come to his rescue against the crusaders, as overlord of the city. Ismat ad-Din Khatun's father died in 1149 and her husband gained complete control over Damascus by 1154.
When Nur ad-Din died in 1174, King Amalric I of Jerusalem took advantage of the situation and besieged the city of Banias. Ismat offered him a bribe to lift the siege, but, hoping for a larger offer, Amalric continued the siege for two weeks, until finally accepting the money along with the release of twenty Christian prisoners. William of Tyre describes Ismat as having "courage beyond that of most women" in this matter. Nur ad-Din's former general Saladin had meanwhile gained control over Egypt, and claimed Damascus as his successor. He legitimized this claim by marrying Ismat at-Din in 1176. She was apparently not his only wife. In 1186, she died of the plague epidemic that broke out in Damascus. However, by the time she died, Saladin was writing letters to her every day; as he was himself recovering from a lengthy illness at the time, news of her death was kept from him for three months.
In Damascus, she was the benefactor of numerous religious buildings, including a madrasa and a mausoleum for her father. She was buried in the Jamaa' al-Jadid in Damascus. She had a daughter Shams un Nisa and a son named As-Salih. Her son was too young to take his father's place and soon after he sat on the throne, the so called foolish ministers who were traitors indeed accompanied him and drove a rift between Salahuddin and As-Salih. After a long time, As-Salih felt sorry for what was done.
- R. Stephen Humphreys, "Women as Patrons of Religious Architecture in Ayyubid Damascus" (Muqarnas, vol. 11, 1994), pg. 43.
- Ibn al-Qalanisi says she left for Aleppo with Nur ad-Din's envoys on April 17, but he does not give, or does not know, her name. The Damascus Chronicle of the Crusades, Extracted and Translated from the Chronicle of Ibn al-Qalanisi, trans. H. A. R. Gibb (Luzac, 1932, repr. Dover Publications, 2002), pg. 276.
- William of Tyre, A History of Deeds Done Beyond The Sea, trans E.A. Babcock and A.C. Krey (Columbia University Press, 1943), vol. 2, bk. 20, ch. 31, pg. 395. William also does not give her name.
- "...apart from references to Nur al-Din's widow Ismat al-Din Khatun...there are almost no details to be found about his wives or the slave girls who bore him children..." Lyons & Jackson 1982, p. 185.
- Görgün 2001, p. 140. sfn error: no target: CITEREFGörgün2001 (help)
- Lyons & Jackson 1982, p. 236.
- Humphreys, pg. 43.
- Görgün, Hılal (2001). "İSMET HATUN". TDV Encyclopedia of Islam, Vol. 23 (İslâm – Kaade) (in Turkish). Istanbul: Turkiye Diyanet Foundation, Centre for Islamic Studies. p. 140. ISBN 9789753894500.
- Lyons, Malcolm Cameron; Jackson, D. E. P. (1982). Saladin: The Politics of the Holy War. Cambridge: Cambridge University Press. ISBN 0-521-31739-8.