Jahan Shah
Recognizing the weakness of Timurid authority in Herat, Jahan Shah of Kara Koyunlu invaded &amp; took the city on June 28, 1458, which was then occupied by Ibrahim Mirza's father Ala al-Dawla Mirza. But Abu Sa'id Mirza could not tolerate this occupation. After Jahan Shah had taken Herat, he was in a tough position and unable to keep it due to pressures from within his kingdom of Kara Koyunlu plus the increasing threat from Uzun Hasan of Aq Qoyunlu. He was obliged to negotiate the borders of his state with Abu Sa'id Mirza and after negotiations Jahan Shah decided to return territorial demarcation to Shah Rukh's times. Thus, Khurasan, Mazandaran and Jurjan were returned to the Timurids and Abu Sa'id Mirza returned and took Herat a second time on December 22, 1458.