《魏书·列传·卷一》
魏国旧例，后宫生下儿子将要立为储君，储君的母亲都被赐令自杀。
魏故事，后宫产子将为储贰，其母皆赐死。
The custom of the Wei Kingdom is that when the harem gives birth to a son, the son will be made crown prince, and the mother of the crown prince is bestowed an order to commit suicide.