Ladislaus IV, 1262–90, king of Hungary (1272–90), son and successor of Stephen V. Ladislaus became unpopular by favoring the Cumans Cumans or Kumans (both: k
..... Click the link for more information. , from whom he was descended through his mother. During his reign, much of it while he was a minor, the magnates and lower nobility were able to establish their power constitutionally, at the expense of the monarchy. There were several revolts against the king, and he was finally slain by the once-favored Cumans. He died heirless; his successor, Andrew III (reigned 1290–1301), who issued from another branch of the Arpad dynasty, was succeeded as king of Hungary by King Wenceslaus III of Bohemia.

Ladislaus IV, king of Poland

Ladislaus IV, 1595–1648, king of Poland (1632–48), son and successor of Sigismund III Sigismund III, 1566–1632, king of Poland (1587–1632) and Sweden (1592–99). The son of John III of Sweden and Catherine, sister of Sigismund II of Poland, he united the Vasa and Jagiello dynasties.
..... Click the link for more information. . His reign was marked by struggles with his subjects and wars with the Swedes, the Russians, and the Ottomans. Ladislaus in his later years vainly sought to establish authority over the nobles. The Cossack Cossacks (kŏs`ăks, –əks), Rus. Kazaki, Ukr.
..... Click the link for more information. revolt, under Chmielnicki Chmielnicki, Khmelnytskyy or Khmelnitsky, Bohdan
..... Click the link for more information. , broke out just before his death. He was succeeded by his brother, John II John II (John Casimir), 1609–72, king of Poland (1648–68), son of Sigismund III . He was elected to succeed his brother, Ladislaus IV. The turbulent period of his reign is known in Polish history as the Deluge.
..... Click the link for more information. .