《资治通鉴·晋纪·晋纪十二》
当初，张的叔父张肃任西海太守，听说晋都长安危亡在即，自请任先锋赴援。
初，实叔父肃为西海太守，闻长安危逼，请为先锋入援。
Originally, Zhang's uncle Zhang Su was the governor of Xihai. When he heard that the Jin capital of Chang'an was about to fall, he volunteered to lead the vanguard to the rescue.