al-Sadiq becomes Imam. Death of Hisham. Al-Walid II becomes Umayyad Caliph. Shi'a revolt in Khurasan under Yahya ibn Zayd. 744: Deposition of Walid II. Yazid III becomes Umayyad Caliph and dies the same year. Ibrahim becomes Umayyad Caliph and is overthrown the same year. Battle of Ain al Jurr. Marwan II becomes Umayyad Caliph. 745: Musa al-Kazim, the seventh Imam of Shiite is born. (Ismail bin Jafar is the 7th rightful Imam according to Ismaili Shia.)Kufa and Mosul occupied by the Kharijites. 746: Battle of Rupar Thutha, Kufa and Mosul occupied by Marwan II. 747: Revolt of Abu Muslim in Khurasan. 748: Battle of Rayy. 749: Battle of Isfahan and Battle of Nihawand. Capture of Kufa by the Abbasids. Al-Saffah becomes the Abbasid Caliph at Kufa. 750: Battle of Zab. Fall of Damascus. End of the Umayyads. 751: Conquest of Wasit by the Abbasids. Murder of the Minister Abu Salama. 751: In the Battle of Talas, the Abbasid armies defeat Tang Dynasty of China. 754: Death of al-Saffah. Accession of al-Mansur as the Caliph. Rebellion of al-Mansur's uncle Abdallah ibn Ali. 755: Murder of Abu Muslim. Sunbadh revolt in Khurasan. 756: Abd-ar-rahman I founds the independent Umayyad state in Spain. 758: Khazar army under Ras Tarkhan invaded and temporarily occupied parts of Azerbaijan and Arran. 759: Abbasid conquest of Tabaristan. 761: Abbasid heir Muhammad ibn al-Mansur (future caliph Al-Mahdi) married famous Abbasid princess Rayta bint al-Saffah as his first wife after his return from Khurasan. 762: Revolt of Muhammad al-Nafs al-Zakiyya. 763: Foundation of Baghdad. Defeat of the Abbasids in Spain. 765: Jafar al-Sadiq, who is the sixth imam of Shiite is poisoned. Musa al-Kazim becomes Imam. Ali ar Rida the eighth imam was born. 766: Sayram in Central Asia taken from the Nestorians. Evangelical army of Arab Muslims and recent converts led by Abd al-Aziz. 767: Khariji state set up by Ibn Madrar at Sijilmasa. Ustad Sees revolt in Khurasan. 772: Battle of Janbi in North Africa. Rustamid state set up in Morocco. 775: Death or the Abbasid Caliph Al-Mansur, accession of Al-Mahdi. 776: Al-Mahdi's second wife was Asma, She grew up at the court. In 775–776, Al-Mahdi formed a sudden attachment for her. He married her, settling on her a marriage portion of one million dirhams. Al-Mahdi divorced Asma bint Atta within months and married al-Khayzuran bint Atta as his third wife. 777: Siege of Saragossa in Spain.