Born Tokugawa Fukumatsumaru (福松丸), he was one of Tokugawa Ieyasu's sons. His mother is believed to have been Otoma, the daughter of Takeda clan retainer Akiyama Torayasu.
Born Tokugawa Fukumatsumaru (福松丸), he was one of Tokugawa Ieyasu's sons. His maternal lineage is believed to stem from Otoma, a member of the Takeda clan through her father Akiyama Torayasu.