《汉书·传·张周赵任申屠传》
晁错任内史，出入东门，有所不便，就另开一门，从南面出入。
错为内史，门东出，不便，更穿一门，南出。
Chao Cuo became the Minister of the Interior, and it was inconvenient to enter and leave the East Gate, so he opened another gate to enter and leave from the south.