Jordan IV of L'Isle-Jourdain

Jordan IV (c. 1220–1288) was Lord of L'Isle-Jourdain in Gascony, son of Bernard II and Indie of Toulouse. Around 1260 he joined a troubadour debate, a torneyamen, with Guiraut Riquier and others. A crusader in the Guelph wars of Italy, he took knights and crossbowmen to Charles of Anjou in 1266 and was enfeoffed in Calabria.

He soon returned to Gascony, but Charles threatened to confiscate his fiefs unless he returned. He lingered until 1282, when he returned with fresh soldiers. In 1285 he joined Philip III's Aragonese Crusade.