His personal name was Zhao Shen. He reigned from 1162 to 1189. His temple name means "Filial Ancestor".
Xiaozong was the second son of Zhao Zicheng (趙子偁) ( ? -1143), known posthumously as Prince Xi of Xiu"an (秀安僖王), who was a sixth cousin of emperors Gaozong and Qinzong.
Zhao Zicheng was the son of Zhao Linghua (趙令譮), known posthumously as Duke of Qing (慶國公), who was a fifth cousin of emperors Huizong and Zhezong. Zhao Linghua was the son of Zhao Shijiang (趙世將), known posthumously as Marquess of Huayin (華陰侯), who was a fourth cousin of Emperor Shenzong.
Zhao Shijiang was the son of Zhao Congyu (趙從郁), known posthumously as Marquess of Xinxing (新興侯), who was a third cousin of Emperor Yingzong. Zhao Congyu was the son of Zhao Weixian (趙惟憲) (979–1016), known posthumously as Duke of Ying (英國公), who was a second cousin of Emperor Renzong.
Zhao Weixian was the second son of Zhao Defang (趙德芳) (959–981), known posthumously as Prince Kanghui of Qin (秦康惠王), who was a first cousin of Emperor Zhenzong, and the second surviving son of Emperor Taizu.
Xiaozong"s mother, titled Princess Xiu (秀王夫人) ( ? -1167), was from the Zhang (張) family. Great-great-great-great-great-grandfather: Emperor Taizu of Song
Great-great-great-great-grandfather: Zhao Defang, Prince Kanghui of Qin
Great-great-great-grandfather: Zhao Weixian, Duke of Ying
Great-great-grandfather: Zhao Congyu, Marquis of Xinxing
Great-grandfather: Zhao Shihiang, Marquis of Huayin
Grandfather: Zhao Linghua, Duke of Qing
Father: Zhao Zicheng, Prince Anxi of Xiu
Brother: Zhao Bogui, Prince Xianjing of Chong.