Wang Shichong
Yang was born in 719 during the Tang Dynasty, early in the reign of Emperor Xuanzong. Her great-great-grandfather Yang Wang (楊汪) was a key official during the reign of Emperor Yang of Sui, and, after the fall of the Sui Dynasty, served one of the contenders to succeed Sui, Wang Shichong; Yang Wang was then killed when Wang Shichong was defeated by Tang forces in 621. Yang Wang was from Huayin (華陰; in modern Weinan, Shaanxi), but his clan subsequently relocated to Yongle (永樂; in modern Yuncheng, Shanxi).