Sakai Tadakatsu (Shōnai)

Sakai Tadakatsu (酒井 忠勝^?, 1594 – November 13, 1647) was a Japanese daimyō of the early Edo period. Tadakatsu and his descendants are linked in the history of the han at Tsuruoka (Shōnai) in Dewa Province.

The Sakai were identified as one of the fudai or insider daimyō clans which were hereditary vassals or allies of the Tokugawa clan, in contrast with the tozama or outsider clans.

Tadakatsu was part of the senior branch of the Sakai.

The fudai Sakai clan originated in 14th century Mikawa Province. The Sakai claim descent from Minamoto Arichika. Arichika had two sons: one of them, Yasuchika, took the name Matsudaira; and the other son, Chikauji, took the name Sakai—and this samuari ancestor is the progenitor of this clan's name.

Sakai Hirochika, who was the son of Chikauji, had two sons, and their descendants gave rise to the two main branches of the Sakai clan.

The Senior branch of the Sakai, are descendants of Sakai Tadatsugu (1527–1596), who was a vassal of Tokugawa Ieyasu. Tadatsugu was charged with the defense of Yoshida Castle in Mikawa province.

In 1578, Sakai Ietsugu (1564–1619) succeeded to his father's role as defender of Yoshida Castle. The Ie- in the beginning of Ietsugu's name was a special honor bestowed by Tokugawa Ieyasu, who intended to emphasize bonds of loyalty with those who were allowed to share in any part of his name.

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