《明史·志·卷三十一》
天顺二年规定，初入害堂，这天早上，王到右顺门的北书堂，面向东，在中间坐下。
天顺二年定，初入书堂，其日早，王至右顺门之北书堂，面东，中坐。
It was stipulated in the second year of Tianshun that when entering the classroom for the first time, the king would arrive at the North Writing Hall of the Right Shun Gate in the morning and sit facing east in the middle.