《明史·志·卷四十九》
詹事掌管府、坊、局的政事，以辅佐教导太子。
詹事，掌统府、坊、局之政事，以辅导太子。
The Imperial Family Preceptor was in charge of the affairs of the palace, lodgings, and bureaus, to assist in teaching and guiding the Crown Prince.