《北史·列传·卷四十》
当初，文襄帝在邺城东面起山造池以供游览观赏，世俗的人对此迷惑不解。孝瑜便在家中制作水堂龙舟，在船上设置旗帜长矛，多次召集兄弟们来宴饮射箭以寻找快乐。
初，文襄于鄴东起山池游观，时俗眩之，孝瑜遂于第作水堂龙舟，植幡槊于舟上，数集诸弟，宴射为乐。
Emperor Wenxiang originally built a mountain and a pool in the east of Yecheng as a place for sightseeing and tours, which had puzzled the common people. Xiao Yu made a water hall dragon boat at his home, setting up flags and spears on the boat, and often invited his brothers to gather together for a banquet and archery to seek joy.