《资治通鉴·汉纪·汉纪三十九》
从汉朝建立以后，直到哀帝、平帝，皇后家族共计二十，而能保全家族和自身的，只有四位皇后。
汉兴以后，迄于哀、平，外家二十，保族全身，四人而已。
From the establishment of the Han Dynasty until the reign of Emperor Ai and Emperor Ping, there were a total of twenty empresses from the family of the empress, but only four of them were able to preserve their families and themselves.