John III of Armagnac (1359 – July 25, 1391) was a count of Armagnac, of Fézensac and Rodez from 1384 to 1391. He was the son of John II of Armagnac, and Jeanne of Périgord.
In 1390, John claimed the kingdom of Majorca, but was overcome by the troops of Juan I of Aragon, in a battle near Navata. John III consequently led military actions in Roussillon. In 1391, he had to leave for Italy in order to come to assistance of Charles Visconti, lord of Parma and husband of his sister, Beatrix of Armagnac, who was in conflict with his cousin Gian Galeazzo Visconti, duke of Milan.
On May 14 1378, John III married Marguerite (1363–1443), countess of Comminges (1363–1443). They had two daughters:
Preceded by John II |
Count of Armagnac 1384–1391 |
Succeeded by Bernard VII |