《后汉书·列传·虞傅盖臧列传》
臧洪年十五，因为父亲对国家有功劳，任命为董子郎，在太学里有名气。
洪年十五，以父功拜童子郎，知名太学。
Zang Hong was fifteen years old. Because his father had contributed to the country, he was appointed as Dongzilang, and he was famous in Taixue.