《资治通鉴·晋纪·晋纪二十四》
前秦王苻坚从邺城到枋头，宴请父老，把枋头改称永昌，终世免除该地的赋税劳役。
秦王坚自鄴如枋头，宴父老，改枋头为永昌，复之终世。
King Fu Jian of the Former Qin travelled from Yecheng to Fangtou, where he hosted a banquet for elders and changed the name of Fangtou to Yongchang, exempting it from taxes and corvée throughout the ages.