Sessai was a younger son of [[Imagawa Yoshitada]] and an uncle to [[Imagawa Yoshimoto]]. He was a Buddhist monk who had served as the abbot of the [[Myoshinji|Myôshinji]] in [[Kyoto]] before returning to [[Suruga province]] and taking up the abbot's position at the [[Rinzaiji]]. Sessai was a capable military commander and Yoshimoto came to rely upon him as his chief general and strategist. He defeated the [[Oda clan|Oda]] at [[second Battle of Azukizaka|Azukizaka]] in [[1548]] and forced the Oda to return [[Anjo castle]] in [[1549]].
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Sessai was a younger son of [[Imagawa Yoshitada]] and an uncle to [[Imagawa Yoshimoto]]. He was a Buddhist monk who had served as the abbot of the [[Myoshinji|Myôshinji]] in [[Kyoto]] before returning to [[Suruga province]] and taking up the abbot's position at the [[Rinzaiji]]. Sessai was a capable military commander and Yoshimoto came to rely upon him as his chief general and strategist. He defeated the [[Oda clan|Oda]] at [[second Battle of Azukizaka|Azukizaka]] in [[1548]] and forced the Oda to return [[Anjo castle]] in [[1549]]. Before his death, he helped broker the [[Hojo-Takeda-Imagawa Alliance]] at the [[Zentoku-ji]] temple.