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Bolesław IV of Warsaw (; – 10 September 1454), was a Polish prince and member of the House of Piast in the Masovian branch. He was Duke of Warsaw during 1429–1454 (under regency until 1436) and sovereign Duke of Podlachia in 1440–1444. He was the second son of Bolesław Januszowic (in turn second son of Janusz I of Warsaw) and Anna Feodorovna of Ratnie, a Lithuanian princess and granddaughter of Algirdas.
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