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Hiraiwa Chikayoshi (平岩 親吉, 1542 – February 1, 1611) was a Japanese daimyō of the early Edo period. He ruled the Inuyama Domain. According to legend, he was involved in a 1611 plot by Tokugawa Ieyasu to assassinate Toyotomi Hideyori, son and intended successor of Toyotomi Hideyoshi, through use of a poisoned manjū. Though the story has been historically discounted, it remains immortalized in a kabuki play.
