Reginald I of Guelders

Reginald I (1255–1326) ruled as Count of Guelders and Zutphen from 1271. In 1276 he married Ermengarde, heiress of Limburg, and ruled that duchy in her right, but she died childless in 1283 and his claim ended with his capture at the Battle of Woeringen in 1288.

In 1286 he married Margaret of Flanders, daughter of Count Guy of Dampierre. Debt after Woeringen left Guelders under Flemish influence. In 1320 his son Reginald II imprisoned him in Montfort Castle, where he died in 1326.