Gümüshtekin, also known as Gumushtekin (died September 1177), was an eunuch who held high offices in the Zengids' empire.
Nur ad-Din, atabeg of Aleppo, appointed him to be his lieutenant in Mosul in Iraq.
[2][3] He made an alliance with as-Salih's cousin Sayf al-Din Ghazi II of Mosul against Ibn al-Muqaddam who had taken control of Damascus.
Ibn al-Muqaddam sought assistance from the Ayubbid ruler of Egypt, Saladin, and surrendered the city to him.
[6] After Gümüshtekin had as-Salih's vizier assassinated in a play for influence over the boy, he was tortured and executed at the walls of Harem for his alleged negotiations with the Franks, or crusaders, in September 1177.