Hojo Kamatari (1831-August 1866) was daimyo of the Sayama Domain from July to August 1866, succeeding Hojo Chikatsune. He took over the leadership of the Sayama Rebellion against the Choshu Domain and attempted to make peace with the Choshu, but Mori Takachika rejected his offer and instead led his army to storm Osaka, killing Kamatari and crushing the rebellion in the process.
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Kamatari in 1866