Reginald III (French: Rainaud or Renaud, known as "The Fat") (13 May 1333 – 4 December 1371) was Duke of Guelders and Count of Zutphen from 1343 to 1361, and again in 1371.
Edward died on 24 August 1371, having been mortally wounded in the Battle of Baesweiler, and Reginald was released (according to the legend, the walls had to be cut away so he could leave); he held the ducal throne for only a short period, dying a few months later.
As he did not have a legitimate child, the succession passed to his sisters: Mathilde (also, Machteld), who was married to John II, Count of Blois, and Maria, wife of William II of Jülich and mother to William I of Guelders and Jülich, on whose behalf she claimed the throne of Guelders.
The sisters and their respective followers (the Heeckerens, from the party led by families of Van Heeckeren and their relatives, the Van Rechterens, supported Mathilde, while the faction known as the Bronkhorsters followed Maria) fought for the duchy of Guelders in the War of the Succession of Guelders.
[2] They did not have children, but Reginald had an illegitimate son, Johan (Jan) of Hattem, and an illegitimate daughter, Ponte of Guelders, who married Johan van Groesbeek (d. 1428), lord of Heumen and Malden[citation needed].