However , the Zizhi Tongjian , harmonizing the account with the dating of other related events , placed the event in 768 .
Jump up ^ According to Li Sheng 's biography in the Old Book of Tang , this event occurred in 769 .
The Zizhi Tongjian , harmonizing the account with the dating of other related events , placed the event in 768 .
Jump up ^ According to Li Sheng 's biography in the Old Book of Tang , this event occurred in 769 .