quality:correction
Course of the rebellion

The An Lushan rebellion signaled a period of disorder spanning the reigns of three Tang dynasty emperors, beginning during the final (Tianbao era) period of the reign of Xuanzong (8 September 712 to 12 August 756), continuing through the reign of Suzong (12 August 756 to 16 May 762) and ending during the reign of Daizong (18 May 762 to 23 May 779), as well as spanning the four imperial claimants of the failed Yan dynasty.