《后汉书·列传·张法滕冯度杨列传》
高祖父杨茂，本河东人，跟随光武帝征伐，做了威寇将军，封为乌伤新阳乡侯。
高祖父茂，本河东人，从光武征伐，为威寇将军，封乌伤新阳乡侯。
Great-grandfather, Yang Mao, was originally from Hedong and followed Emperor Guangwu in his campaigns, becoming the General Who Subdues Robbers and was granted the title of Lord of Wu Shang Xinyang Township.