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Born in [[Kagoshima castle]] in [[1817]], Hisamitsu was [[Shimazu Narioki|Shimazu Narioki's]] fifth child. His mother was [[Oyura no kata]], and he was thus a half-brother to [[Shimazu Nariakira]]. Hisamitsu was considered the head of the Echizen (Shigetomi) branch of the Shimazu, and the founder or ancestor of the Tamazato branch. Narioki brought Hisamitsu in to participate in discussions and decisions regarding the governance of the domain beginning in [[1848]]/4.<ref>''Ishin Shiryô Kôyô'' 維新史料綱要, vol 1 (1937), 143.</ref>

Born in [[Kagoshima castle]] in [[1817]], Hisamitsu was [[Shimazu Narioki|Shimazu Narioki's]] fifth child. His mother was [[Oyura no kata]], and he was thus a half-brother to [[Shimazu Nariakira]]. Hisamitsu was considered the head of the Echizen (Shigetomi) branch of the Shimazu, and the founder or ancestor of the Tamazato branch. Narioki brought Hisamitsu in to participate in discussions and decisions regarding the governance of the domain beginning in [[1848]]/4.<ref>''Ishin Shiryô Kôyô'' 維新史料綱要, vol 1 (1937), 143.</ref>

Though supported by his mother, Hisamitsu lost to Nariakira in a succession dispute in [[1851]], and was passed over as lord of the domain. However, when Nariakira died suddenly in 1858, he was succeeded by Hisamitsu's teenage son, Tadayoshi. Hisamitsu then served as regent for a time, and exercised considerable influence over domain policy.

Though supported by his mother, Hisamitsu lost to Nariakira in a succession dispute in [[1851]], and was passed over as lord of the domain. However, when Nariakira died suddenly in 1858, Nariakira was succeeded by Hisamitsu's teenage son, Tadayoshi. Hisamitsu then served as regent for a time, and exercised considerable influence over domain policy.

==As Regent==

==As Regent==