Tadayoshi was the son of [[Yamauchi Yasutoyo]] and succeeded [[Yamauchi Kazutoyo|Kazutoyo]] as [[daimyo|daimyô]] of Tosa when the latter died childless. He rendered service to the [[Tokugawa clan|Tokugawa]] at the [[Osaka Campaign|Osaka Castle campaigns]].
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Tadayoshi was the son of [[Yamauchi Yasutoyo]] and succeeded [[Yamauchi Kazutoyo|Kazutoyo]] as [[daimyo|daimyô]] of Tosa when the latter died childless. He rendered service to the [[Tokugawa clan|Tokugawa]] in a number of significant ways, including at the [[Osaka Campaign|Osaka Castle campaigns]], and was granted use of the honorary name [[Matsudaira clan|Matsudaira]] in [[1610]], by [[Tokugawa Hidetada]].<ref>Luke Roberts, "Cultivating Non-National Historical Understandings in Local History," Joshua Fogel (ed.) ''The Teleology of the Nation-State'', Univ of Pennsylvania Press (2004), 167.</ref>