《北齐书·本纪·卷二》
六月初八日，神武前往天池，得一瑞石，石面隐约有文字，曰 六王三川 。
六月壬申，神武如天池，获瑞石，隐起成文曰 六王三川 。
On June 8th, Shenwu went to Tianchi Mountain and obtained an auspicious stone with the words "Six Kings, Three Rivers" faintly visible on its surface.