Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Uzun Hasan or Hassan (1423 January 6, 1478) , Sultan of the Aq Qoyunlu dynasty, or White Sheep Turkmen. Hassan ruled in parts of present-day western Iran, Iraq, Turkey, Azerbaijan and Armenia between 1453 and 1478.Timur appointed his great-grandfather, Kara Yülük Osman, as a governor of Diyarbak r (in modern-day Turkey), with the cities of Erzincan, Mardin, Roha (or Urfa), and Sivas. Uzun Hasan defeated Jahan Shah, prince of the Kara Koyunlu or Black Sheep Turkmen in 1467.