Marie of Guelders (about 1327-May 12, 1405) was daughter of Reginald II, Duke of Guelders and Sophie Berthout, lady of Malines. On December 25, 1362, she married William II, Duke of Jülich (1325-13 December 1393). Children: 1 William (1364-1402), duke William I of Guelders and of William VII of Jülich 2 Reinald (1366-23 Juni 1423), duke Reinald IV of Guelders and of Jülich 3 Johanna (11 September 1362-25 August 1428), who married Lord John V of Arkel Marie of Guelders was one of two pretenders to the title of Duchess of Guelders and Countess of Zutphen on behalf of her son during the Warof the Guelderian Succession from 1371 to 1379. The war began after the deaths of her brothers, Reginald III of Guelders and Edward of Guelders. Edward died from wounds received at the Battle of Baesweiler, and Reginald, who was known as the fat, died months later. Succession was also claimed by Marie's sister, Mathilda, whose side was called the Heeckerens and were led by Frederik van Heeckeren van der Eze (1320-1386). Her party was called the Bronckhorsters and was led by Gijsbert V van Bronckhorst (1328-1356). Upon victory of her party, the title of Duke of Guelders went to her son, William. Reinalds dochter Maria was getrouwd met de hertog van Gulik. Toen hertog Reinald III in 1371 stierf zonder mannelijke erfgenaam, volgde de Eerste Gelderse Successieoorlog. Deze leidde er in 1383 toe dat Maria's zoon Willem III van Gulik hertog van Gelre werd. Vanaf 1393 was hij tevens hertog van Gulik. In 1402 stierf hij kinderloos en kwam Gelre in handen van zijn broer Reinald IV. Nadat ook deze kinderloos was gestorven in 1423, werden Gelre en Gulik weer gescheiden. https://nl.wikipedia.org/wiki/Hertogdom_Gelre