Matsudaira Saku
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In this Japanese name, the surname is Matsudaira.
Matsudaira Saku (松平 佐久) (1846–1909) was a Japanese figure of the mid-19th century. The daughter of Tashiro Genbei of Edo, she became the concubine of the Aizu lord Matsudaira Katamori and gave birth to several of his children.[1]