Yūki Masakatsu (結城 政勝, 1503 – September 2, 1559) was a Japanese samurai during the Sengoku period.
He was the head of the Yūki clan.
[1] As clan leader, Masakatsu developed a code of provincial laws (bunkoku-hō).
In 1556, he published "new laws of the Yūki family" (結城氏法度, Yūki-shi Hatto).
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