Tadanaga Tokugawa was a Japanese daimyō of the early Edo period. Often called Suruga Dainagon (the major counsellor of Suruga).
Background
Tadanaga Tokugawa was born in 1606. The date of his birth is uncertain, and is variously given as May 7, June 1, and December 3. His birth name was Kunichiyo (国千代). The son of the second shōgun Tokugawa Hidetada, his elder brother was the third shōgun Tokugawa Iemitsu.
Career
In 1616, was made Lord of Kai (Yamanashi Prefecture), and was granted fief of 550,000 koku of rice in provinces, of Suruga (Shizuoka Prelecture), Totomi (Shizuoka Prefecture), Kai (Yamanashi Prefecture) and Shinano (Nagano Prefecture). Was commonly called Suruga Dainagon (vice minister). Unending Shogun Iemitsu, his elder brother, (1632), was exiled to Takasaki (Gumma Prefecture).
Personality
Tadanaga was particularly loved by parents when he was a child and became haughty and arrogant. He was on bad terms with his elder brother, and when Shogun Hidetada died, a rumor circulated that he had ambitions of becoming Shogun. He committed suicide by order of Shogun Iemitsu.
Connections
He married Masahime (1614-1690) later Shoko-in, the daughter of Oda Nobuyoshi, who was the son of Oda Nobunaga.