The Abbasid Caliphate weakened after the Abbasid civil war in the 810s, and caliphal power was challenged by secessionist tendencies among peripheral rulers, including those of Tbilisi. At the same time, the emirate became a target of the resurgent Georgian Bagrationi dynasty who were expanding their territory from Tao-Klarjeti across Georgian lands. The Emirate of Tbilisi grew in relative strength under Ishaq ibn Isma'il (833–853), who was powerful enough to quell the energies of the Georgian princes and to contend with the Abbasid authority in the region. He withheld his annual payment of tribute to Baghdad, and declared his independence from the Caliph. To suppress the rebellion, in 853 Caliph al-Mutawakkil dispatched a punitive expedition led by Bugha al-Kabir (also known as Bugha the Turk) who burned Tbilisi to the ground and had Ishaq decapitated, putting an end to the city's chance to become the center of an independent Islamic state in the Caucasus. The Abbasids chose not to rebuild the city extensively, and as a result the Muslim prestige and authority in the region began to wane.