Matsudaira Kiyoyasu
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Matsudaira Kiyoyasu (????-1535) the 7th lord over the Matsudaira clan during the Sengoku period (16th century) of Japan. Kiyoyasu was the grandfather of the exceedingly famous unifier of Japan, Tokugawa Ieyasu. Kiyoyasu soon gained control of the whole of the northern region of Mikawa province after the Saigo had surrended after four generations of conflict between the two clans. The Okazaki castle was also built as a monument towards the Matsudaira's power. However, certain hatred began growing within a certain retainer of Kiyoyasu's, a retainer by the name of Abe Masatoyo. During the year of 1535, this certain retainer had somehow snuck into Kiyoyasu's secret chambers and slew him with his Muramasa blade. After the revolt had been subdued, and peace returned to the Matsudaira, Matsudaira Hirotada, father of Ieyasu, would succeed to the throne of power within the Matsudaira clan.
[edit] Reference
The Samurai Sourcebook