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Matsudaira Kiyoyasu (September 28, 1511 – November 29, 1535) served as the 7th lord of the Matsudaira clan during Japan's tumultuous Sengoku period. Renowned as the paternal grandfather of Tokugawa Ieyasu, one of Japan's "great unifiers," Kiyoyasu expanded his clan’s influence, bringing all of northern Mikawa Province under his control after subduing the Saigo clan. His power was further symbolized by the construction of Okazaki Castle, a testament to the Matsudaira’s growing dominance.

Despite his achievements, Kiyoyasu’s life was tragically cut short. Accounts of his death vary, but most point to betrayal within his ranks. In one version, Kiyoyasu was slain in 1535 by Abe Masatoyo, a resentful retainer, who used a Muramasa blade to assassinate him during a campaign against Moriyama Castle. Another version, as recounted by historian A. L. Sadler, attributes Kiyoyasu's death to a tragic misunderstanding. When a rumor falsely implicated his loyal retainer Abe Sadayoshi in treachery, Sadayoshi’s son, Yashichi, mistook a commotion for his father's imminent arrest and, in a rash act, killed Kiyoyasu, only to be executed himself.

Following Kiyoyasu’s death at the young age of 25, his ten-year-old son, Matsudaira Hirotada, inherited leadership of the Matsudaira clan. The ensuing Battle of Idano restored stability to the clan’s domain, setting the stage for Hirotada to guide the Matsudaira through the Sengoku period and pave the way for his son, Tokugawa Ieyasu, to rise to greatness.

 


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