In about 1100, Fujiwara no Kiyohira moved his home from Fort Toyoda in present-day Esashi, in the city of Ōshū to Mount Kanzan in Hiraizumi.
Omkring år 1100 flyttade Fujiwara no Kiyohira sitt hem till fästningen Toyoda i dagens Esashi i staden Ōshū till berget Kanzan i Hiraizumi.