Tokugawa Ieyasu
Ieyasu-Nobunaga Alliance (1562–1582)

Sometime in the aftermath of the Okehazama battle where Imagawa Yoshimoto was slain, Ieyasu formed the so-called Kiyosu Alliance with Oda Nobunaga, daimyo lord of Owari Province and the head of Oda clan.

In 1563, Matsudaira Nobuyasu, the first son of Motoyasu, was married to Oda Nobunaga's daughter Tokuhime. In February, Matsudaira Motoyasu changed his name to Matsudaira Ieyasu. Some historian believe that these actions stimulated the pro-Imagawa faction, including the Sakurai and Okusa Matsudaira families, which led to the simultaneous uprising against Ieyasu in the following year.
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