Matsudaira Kiyoyasu

was the 7th lord over the Matsudaira clan during the Sengoku period (16th century) of Japan. Kiyoyasu was the paternal grandfather of the third "great unifier of Japan", Tokugawa Ieyasu. Biography Kiyoyasu gained control of the whole of northern Mikawa Province after the Saigo clan surrendered following four generations of conflict. Okazaki Castle was also built as a monument to the Matsudaira's power. Following this conquest, one of Kiyoyasu's retainers, Abe Masatoyo, began to resent Kiyoyasu. In 1535, Abe somehow entered Kiyoyasu's secret chambers and slew him with his Muramasa blade. Another version of Matsudaira Kiyoyasu's death has been told by the author A. L. Sadler: