Emperor Kōkaku
Prince Moriosa was born in Kyoto, the 10th son of Prince Fushimi Sadayoshi (1775–1841), the nineteenth head of 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 house fail to produce an heir. He was adopted by Emperor Kōkaku, but later became a Buddhist priest at the "monzeki" temple of Emman-in. He was named "Kajii-no-miya" and rose to become head of the Tendai sect.