Tokugawa Tadanaga (徳川 忠長?, 1606 – January 5, 1634) was a Japanese daimyo of the early Edo period. The son of the second shogun Tokugawa Hidetada, his elder brother was the third shogun Tokugawa Iemitsu.
Often called Suruga Dainagon (the major counsellor of Suruga), Tadanaga was born in 1606. The date of his birth is uncertain, and is variously given as May 7, June 1, and December 3. As a youth, he received support from his mother, Oeyo (or Sūgen'in), who favored him over her other son Takechiyo (the future Iemitsu) to become the third shogun. Later, his misconduct resulted in his being stripped of office, and he committed seppuku.
- 1606: Born to Hidetada and Sūgen'in
- 1624: Appointed daimyo of Suruga, Tōtōmi, and Kai Provinces, with a rating of 550,000 koku (see Kōfu Domain)
- 1626: Kills a retainer and commits other acts of violence
- 1631: Placed under house arrest in Kofu
- 1632: Stripped of office
- 1633 (or 1634): Commits seppuku under arrest in Takasaki
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