《魏书·列传·卷二十一》
先前，姚兴派遣将领攻打洛阳，司马德宗的雍州刺史杨佺期派遣使者向常山王元遵请求援兵，元遵具状奏闻，太祖派遣张济作为元遵的从事中郎回报杨佺期。
先是，姚兴遣将攻洛阳，司马德宗雍州刺史杨佺期遣使乞师于常山王遵。遵以状闻，太祖遣济为遵从事中郎报之。
Previously, Yao Xing sent a general to attack Luoyang, Sima Dezong's governor of Yongzhou Yang Quanyi sent an envoy to Changshan King Yuan Zun to ask for reinforcements, Yuan Zun presented a memorial, and the founding father sent Zhang Ji as Yuan Zun's Zhishi Zhonglang to report back to Yang Quanyi.