Reginald I
The conflict arose after Duke Waleran IV of Limburg, a scion of the Lotharingian Ardennes-Verdun dynasty, had died without male heirs in 1279. His duchy was inherited by his daughter Ermengarde, who had married Count Reginald I of Guelders about 1270. Her husband claimed the Limburg heritage and in 1282 had his ducal title recognized by the German king Rudolf I.