Hatet mot ukrainska flyktingar växer i Polen

Gustav I (Gustav Vasa, r. 1523–1560): founder of the Vasa dynasty; though primarily Swedish, his daughter Catherine married into the Polish–Lithuanian royal family (see below), linking lines.

Sigismund III Vasa (r. 1592–1599 as King of Sweden; 1587–1632 as King of Poland–Lithuania): son of John III of Sweden (a Vasa) and Catherine Jagiellon of Poland. Catherine Jagiellon was a Polish princess (member of the Jagiellon dynasty), so Sigismund had clear Polish ancestry through his mother. He was raised in Poland and ruled both kingdoms for a time.

Charles IX (r. 1604–1611): though a member of the Swedish Vasa family, his niece/relations tied into Polish lines via marriages; his own ancestry is mostly Swedish but the Vasa family increasingly intermarried with Polish nobility.

The later Vasa branch: After John III’s marriage to the Polish princess Catherine Jagiellon, several subsequent Vasa claimants and rulers had Polish blood, notably:

Sigismund III Vasa (explicitly Polish maternal ancestry).
His sons and descendants (including Władysław IV Vasa and others in Poland) had mixed Polish–Swedish ancestry; some competed for or held claims in Sweden.
Charles X Gustav (r. 1654–1660) and later Charles XI/Charles XII: these were from the House of Palatinate-Zweibrücken (a branch of Wittelsbach), not Polish; their ancestry is German rather than Polish.