His proper name was Atsunaga (敦 良). He was the third son of Ichijō - tennō and the younger son of two sons of Empress Fujiwara no Shoshi, whose father was Fujiwara no Michinaga.
A woman go Ichijōs was also a daughter Michinagas, but his wife, the Princess Teishi (祯 子 内 亲王, naishinnō ), was a daughter of Sanjō - tennō.
During his reign the power Michinagas reached the peak.
He was the father of Go - Reizei tennō by the daughter Michinagas and the Go- Sanjō - tennō of Princess Teishi.
- Born in 1009
- Died in 1045
- Heian period