Wang Dao
Wang Xianyuan came from a noble family, as her father Wang Yan (王偃) was a great-great-grandson of the famed Jin prime minister Wang Dao. His father Wang Gu (王嘏) was a minister during Jin, and his mother was Princess Poyang, the daughter of Emperor Xiaowu of Jin. Wang Yan's wife was also a princess—Liu Rongnan (劉榮男), the Princess Wuxing, daughter of Liu Song's founder Emperor Wu. (It is not clear whether she was Wang Xianyuan's mother.)