Date crest

Yoshitaka Osaki (died 1591) was a Date retainer who led the Kasai-Osaki Uprising in 1591 to try and aid Masamune Date in taking back his property, but was killed.


Yoshitaka Osaki was born in Miyagi Province, and became a Date retainer. He was loyal to Masamune Date, the daimyo from Iwate Province, and rebelled in his favor of him in 1591 after Masamune Date's lands and titles were stripped from him. Yoshitaka was killed by Concubine Kai while trying to attack her father Ujinaga Narita, the commander of the reinforcements for the Toyotomi troops.

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