An Lushan, leader of a revolt against the Tang dynasty and emperor of Yan, was assassinated in a plot involving his own son, An Qingxu. AD 757: Year 757 (DCCLVII) was a common year starting on Saturday of the Julian calendar. The denomination 757 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. January 29, 757. Wiki link