Mechteld of Guelders

Mechteld of Guelders (c. 1324 – 21 September 1384) was the second daughter of Duke Reginald II and Sophia Berthout. She married Godfrey of Loon-Heinsberg in 1336 and, widowed, John, Count of Cleves, in 1348; both marriages were childless.

When her brothers died without heirs in 1371, she claimed Guelders as suo jure duchess against her sister Mary. Backed by her third husband John II of Blois, she fought the First War of the Guelderian Succession from 1371 to 1379, lost, and retired to her dower at Huissen, where she died.