Nikaidō clan (二階堂氏) is a Japanese samurai kin group.

History

The Nikaidō claim descent from Fujiwara no Yukimasa who was the first to take the Nikaidō name. The clan ruled over the Iwase District of Mutsu Province during the Sengoku period. Sukagawa Castle was their main residence.

Gifu Castle

During the Kamakura period, the clan's power stretched down to Mino Province, where they constructed Inabayama Castle atop Mount Inaba between 1201 and 1204.

Clan heads

Notable retainers and family