《隋书·列传·卷十五》
此后，周太祖为他兄长之子晋公宇文护娶元孝矩的妹妹为妻。夫妻感情很好。
其后周太祖为兄子晋公护娶孝矩妹为妻，情好甚密。
After that, Emperor Taizu of Zhou married the sister of Yuan Xiaocu to Duke Jin of Yuwen, his elder brother's son. The couple enjoyed a good relationship.