Question: Who is the paternal grandfather of Władysław Iv Vasa?
Sentence (from "Władysław IV Vasa"): Władysław's death marked the end of relative stability in the Polish–Lithuanian Commonwealth, as conflicts and tensions that had been growing over several decades came to a head with devastating consequences, notably the largest of the Cossack uprisings – the Khmelnytsky Uprising (1648) – and the Swedish invasion ("the Deluge", 1655–60).
Relevant evidence: No