Yamashina-no-miya

The Yamashina (山階宮, Yamashina-no-miya?) (princely house) was the third oldest collateral branch (ōke) of the Japanese Imperial Family created from the Fushimi-no-miya, the oldest of the four branches of the imperial dynasty allowed to provide a successor to the Chrysanthemum throne should the main imperial line fail to produce an heir.