Tokugawa Nobuyasu
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Tokugawa Nobuyasu (徳川 信康? 13 April 1559—5 October 1579) was the eldest son of Tokugawa Ieyasu. As a child Nobuyasu was sent to the Imagawa capital of Sumpu, located in Suruga Province (modern-day Shizuoka Prefecture) as a hostage. Later he was named keeper of Okazaki Castle in Mikawa Province (modern-day Aichi Prefecture), the birth place of his father, and took part in the battle of Nagashino in 1575. Several years later he was suspected of treachery by Oda Nobunaga and was confined to Ohama and then Futamata, before receiving an order to commit suicide from his father in 1579, who was acting on Oda Nobunaga's wishes, despite Nobunaga having married his daughter Tokuhime (1559-1636) to Nobuyasu.
Nobuyasu is not believed to have been a popular figure in his time, as his demise might attest. Despite this, it is said that Tokugawa Ieyasu deeply regretted the part he played in his death.