《汉书·志·五行志下之上》
历史上记载夏后氏的衰亡，有两条龙停在夏的朝廷，而且说 我，是裹国的两君王 。
史记夏后氏之衰，有二龙止于夏廷，而言 余，褒之二君也 。
History records that when the Xia line declined, there were two dragons who came to rest in the court of Xia, and said, 'We are the two lords of the State of Jian.'