《资治通鉴·隋纪·隋纪一》
后来隋文帝担任北周丞相时，任命杨瓒为大宗伯，杨瓒恐怕招致灭族之祸，曾经暗中谋划除掉隋文帝，隋文帝发现后隐瞒了此事。
帝为周相，以瓚为大宗伯，瓚恐为家祸，阴欲图帝，帝隐之。
Later, when Emperor Wen of Sui served as the prime minister of Northern Zhou, he appointed Yang Zan as the Grand Master. Yang Zan feared that he would be exterminated, and he once secretly planned to get rid of Emperor Wen of Sui. After Emperor Wen of Sui found out, he kept the matter a secret.