John I of Armagnac

Jean I of Armagnac (1306–1373) succeeded his father Bernard VI in 1319 as Count of Armagnac, Fezensac and Rodez, the last through his mother Cécile, heiress of Rodez. His 1327 marriage to Béatrice de Clermont brought Charolais.

On 28 July 1340 he destroyed Robert III of Artois's Anglo-Flemish army near Saint-Omer, but in 1355, as the Black Prince raided the south, he held Toulouse and avoided battle. The 1360 Treaty of Brétigny handed Rouergue to England. On 5 December 1362 Gaston Fébus of Foix, his old rival, captured him at Launac, and he paid three hundred thousand gold florins for his freedom.

English troops held Rodez until he beat them at Mondalazac in January 1369. He died on 16 May 1373 and left the county to his son John II.