《资治通鉴·陈纪·陈纪二》
丙午，北周封周愍帝的儿子宇文康为纪国公，皇子宇文为鲁国公。
丙午，周封愍帝子康为纪国公，皇子赟为鲁国公。
On Bingwu, the Northern Zhou Dynasty enfeoffed Emperor Zhou Mindi's son Yuwenkang as the Duke of Jiguo and Prince Yuwen as the Duke of Luguo.