Sakai Tadakatsu

Sakai Tadakatsu (酒井 忠勝?, July 21, 1587 – August 25, 1662), also known as Sanuki-no-kami and Minamoto-no Tada katsou, was tairō, rōjū, master of Wakasa-Obama castle (若狭国小浜城) and daimyo of Obama Domain in Wakasa province in the mid-17th century. As tairō, he was one of the two highest ranking bakufu officials in Tokugawa Japan from his elevation on November 7, 1638 through May 26, 1656.

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.