was a Japanese daimyō of the early Edo period.
Tadatoshi was the son of Aoyama Tadanari, a Tokugawa vassal of the Sengoku period who was born in Mikawa Province. Tadatoshi, like his father, was a Tokugawa vassal, and was famous for his role as the third shōgun Iemitsu's teacher.
He became a daimyō in 1603, when Tokugawa Ieyasu granted him the domain of Edosaki.
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