United Duchies of Jülich-Cleves-Berg
The Cleves-Mark territories became one of the most significant estates of the Lower Rhenish–Westphalian Circle in 1500, rivaled by the Prince-Bishops of Münster. In 1511 John III of La Marck, son of Duke John II of Cleves, by his marriage with Maria inherited the fiefs of Jülich and Berge upon the death of his father-in-law Duke William IV. When John III succeeded his father as Duke of Cleves in 1521, the states of Jülich, Berge, Cleves and Mark formed the United Duchies of Jülich-Cleves-Berg. His daughter Anne of Cleves (1515–1557) even became Queen Consort of England for a few months in 1540, as her brother William, duke since 1539, quarrelled with Emperor Charles V over the possession of Guelders and sought support from King Henry VIII.