Amaneiko 洽子 (dates unknown) was the daughter of Harusumi no Yoshitada 春澄善縄 (797-870), a regional noble from Inaba in Ise, who was granted the name of Harusumi in 828. Her original name was Takaiko 高子, but this was changed in 877, as it was the same as that of Fujiwara no Takaiko 藤原高子 (842-910) , the consort of Emperor Seiwa 清和 (850-880; r. 858-876) and mother of Emperor Yōzei 陽成 (869-949; r. 876-884). Yoshitada had four children, of whom Amaneiko was the only one to enjoy any success at court, meaning that the family line ended after her death. Amaneiko had a respectable court career, serving five emperors, and eventually reaching Junior Third Rank in 902, a remarkable achievement for a court lady from a provincial background. Emperor Uda 宇多 (867-931; r. 887-897) regarded her extremely highly, singling her out for mention in his Kanpyō no go-yukai 寛平御遺誡 (897), a set of instructions and advice he wrote for Emperor Daigo 醍醐 (885-930; 897-930), when he abdicated and Daigo took the throne at the age of thirteen.