Reginald III of Guelders

Reginald III of Guelders, called the Fat (1333–1371), was the elder son of Reginald II and Eleanor, and his reign was shaped by his younger brother's rebellion. He succeeded as duke in 1343, with his mother acting as regent, and from 1350 his brother Edward contested the duchy.

In 1361 he was beaten at Tiel and shut in Nijenbeek Castle, where he grew so stout that he could not have left even through an open door; legend says the walls had to be cut away to free him.

After Edward was mortally wounded at the Battle of Baesweiler in 1371, Reginald was released and restored, but he died that December without a legitimate heir. His half-sisters then fought the War of the Succession of Guelders.