《魏书·列传·卷十》
一年多后，皇后的父亲于劲，因皇后很久没有生育，就上奏劝说增加嫔妃侍妾。
岁余，后父于劲，以后久无所诞，乃上表劝广嫔侍。
A little over a year later, the father of the empress, Yu Jin, worried that it had been a long time since the empress had given birth, memorialized, suggesting that more concubines be added.