 Mishima's early childhood was dominated by the presence of his grandmother, Natsuko, who took the boy, separating him from his immediate family for several years.Natsuko was the granddaughter of Matsudaira Yoritaka, the "daimyō" of Shishido in Hitachi Province, and had been raised in the household of Prince Arisugawa Taruhito; she maintained considerable aristocratic pretensions even after marrying Mishima's grandfather, a bureaucrat who had made his fortune in the newly opened colonial frontier in the north and who eventually became Governor-General of Karafuto Prefecture on Sakhalin Island.Through his grandmother, Mishima was a direct descendant of Tokugawa Ieyasu.