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Munenobu was the eldest son of [[Shimazu Tsugutoyo]]; his mother was a daughter of the [[Shibuya clan]]. He was raised as an adopted child of Tsugutoyo's wife [[Take-hime]] (an adopted daughter of [[Shogun]] [[Tokugawa Tsunayoshi]]), and was as a result granted the privilege of using the [[Matsudaira clan|Matsudaira]] name.

Munenobu was the eldest son of [[Shimazu Tsugutoyo]]; his mother was a daughter of the [[Shibuya clan]]. He was raised as an adopted child of Tsugutoyo's wife [[Take-hime]] (an adopted daughter of [[Shogun]] [[Tokugawa Tsunayoshi]]), and was as a result granted the privilege of using the [[Matsudaira clan|Matsudaira]] name.

Upon his father's retirement in [[1746]], Munenobu became head of the clan, and of Satsuma domain. He struggled with a heavy household debt, and attempted to run the domain frugally. He died young, however, at age 22, in [[Kagoshima]], after less than three years as lord. During that brief period, however, he escorted a [[Ryukyuan embassy to Edo]] in [[1748]], and was elevated to Upper Junior Fourth Rank.<ref>Yokoyama Manabu 横山学, ''Ryûkyû koku shisetsu torai no kenkyû'' 琉球国使節渡来の研究, Tokyo: Yoshikawa kôbunkan (1987), 67.</ref> Upon his death, he was succeeded by his younger brother [[Shimazu Shigetoshi]].

Upon his father's retirement in [[1746]], Munenobu became head of the clan, and of Satsuma domain. He struggled with a heavy household debt, and attempted to run the domain frugally. He retired in [[1749]] after only three years as the lord, journeying to Edo for his retirement<ref>''Shinpen Chiryû shishi 5: Chiryû-juku honjin go-shukuchô'' 新編知立市史５：池鯉鮒宿本陣御宿帳, Chiryû, Aichi: Chiryû-shishi hensan iinkai (2011), 244.</ref> and passing on leadership of the domain to his younger brother [[Shimazu Shigetoshi]]. During that brief period, however, he escorted a [[Ryukyuan embassy to Edo]] in [[1748]], and was elevated to Upper Junior Fourth Rank.<ref>Yokoyama Manabu 横山学, ''Ryûkyû koku shisetsu torai no kenkyû'' 琉球国使節渡来の研究, Tokyo: Yoshikawa kôbunkan (1987), 67.</ref> Munenobu died less than a year into his retirement, at the young age of 21.