Gaston of Fézensaguet

Gaston d'Armagnac (c. 1275–1320) was the younger son of Count Géraud VI of Armagnac and Mathe de Béarn. When his elder brother Bernard VI inherited the family counties in 1285, Gaston received Fézensaguet as his share and became the founder of its junior viscomital branch.

His first marriage remained childless and ended in repudiation; in 1298 he married Valpurge de Rodez, who bore his heir Géraud III in 1299. Gaston died in 1320 and was succeeded in Fézensaguet by Géraud III.