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Events on Wednesday 20 May 1648 1
1595 – 1648Władysław IV Vasa (1595-1648)Died 20 May 1648, aged 52King of Poland and claimant to the Swedish throne, Władysław IV ruled from 1632 until his death at Merkinė on 20 May 1648. His death, amid rising tensions with the Cossacks, helped precipitate the Khmelnytsky Uprising later that year.