《汉书·传·外戚传下》
昔日季武子建造寝陵，杜氏的坟墓恰好在西阶下，杜氏请求合葬，季武子同意了。
昔季武子成寝，杜氏之墓在西阶下，请合葬而许之。
In the past, Ji Wushu built a tomb and Du's grave happened to be below the west steps, Du requested to be buried together with him, and Ji Wushu agreed.