He was Emperor Ninmyo's fourth Prince, and his mother was Empress Dowager, posthumously conferred, FUJIWARA no Takushi (Sawako) (the Grand Minister, posthumously conferred, Shoichii (Senior First Rank), FUJIWARA no Fusatsugu's daughter).
仁明天皇第四皇子で、母は贈皇太后藤原沢子（贈太政大臣正一位藤原総継の娘）。