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Hoshina Masayuki was a shogunal advisor and regent to the young [[Tokugawa Ietsuna]], who succeeded his father [[Tokugawa Iemitsu]] at the age of ten. Hoshina was a son of [[Tokugawa Hidetada]], half-brother to [[Tofukumon-in|Tôfukumon-in]], and uncle to the young shogun Ietsuna.

Hoshina Masayuki was a shogunal advisor and regent to the young [[Tokugawa Ietsuna]], who succeeded his father [[Tokugawa Iemitsu]] at the age of ten. Hoshina was a son of [[Tokugawa Hidetada]], half-brother to [[Tofukumon-in|Tôfukumon-in]], and uncle to the young shogun Ietsuna.

Though a son of a shogun, Masayuki was not born to Hidetada's primary wife, [[Tokugawa Eyo-no-kata]], who forbade him, therefore, from staying within the household, and arranged to have him adopted by the [[Hoshina clan]]. He rose within the family to become ''daimyô'' of [[Aizu han]], before returning to [[Edo]] to serve as shogunal regent for his young nephew.

Though a son of a shogun, Masayuki was not born to Hidetada's primary wife, [[Oeyo]], who forbade him, therefore, from staying within the household, and arranged to have him adopted by the [[Hoshina clan]]. He rose within the family to become ''daimyô'' of [[Aizu han]], before returning to [[Edo]] to serve as shogunal regent for his young nephew.

In [[1664]], Hoshina helped resolve a domainal succession issue, when his son-in-law [[Uesugi Tsunakatsu]], lord of [[Yonezawa han]], died without a direct heir. Hoshina advised that the domain be split, and given to [[Uesugi Tsunanori]]. While this decision led to great financial difficulties for the domain, in the end, the [[Uesugi clan]], continuing to feel indebted to Hoshina, and by extension to the [[Tokugawa clan]], sided with the pro-shogunate [[Oetsu Reppan Domei|Ôetsu Reppan Dômei]] in the [[Boshin War]] of [[1868]].

In [[1664]], Hoshina helped resolve a domainal succession issue, when his son-in-law [[Uesugi Tsunakatsu]], lord of [[Yonezawa han]], died without a direct heir. Hoshina advised that the domain be split, and given to [[Uesugi Tsunanori]]. While this decision led to great financial difficulties for the domain, in the end, the [[Uesugi clan]], continuing to feel indebted to Hoshina, and by extension to the [[Tokugawa clan]], sided with the pro-shogunate [[Oetsu Reppan Domei|Ôetsu Reppan Dômei]] in the [[Boshin War]] of [[1868]].