《后汉书·列传·李固列传》
这时冲帝将北卜山陵作为葬址，李固便建议道： 今天处处有寇贼，军兴用费加倍开支，新创宪陵，赋发非一。
时，冲帝将北卜山陵。固乃议曰 今处处寇贼，军兴用费加倍，新创宪陵，贼发非一。
At this time, Chongdi chose Bei Bu Shanling as his burial site. Li Gu suggested: "Today there are thieves and bandits everywhere. The military's expenses have doubled. Establishing a new imperial tomb will require taxes more than once."