In [[1773]]/6, Prince Yomitan led a mission to [[Kagoshima]] in congratulations for [[Keihime]], daughter of Lord [[Shimazu Shigehide]]. In [[1777]], he changed his ''nanori'' (given name) from Chôkô to Chôken.
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In [[1773]]/6, alongside Crown Prince [[Sho Tetsu|Shô Tetsu]], Prince Yomitan led a mission to [[Kagoshima]] in congratulations for [[Keihime]], daughter of Lord [[Shimazu Shigehide]]. In [[1777]], he changed his ''nanori'' (given name) from Chôkô to Chôken.