Eskivat de Chabanais , died in 1283, was count de Bigorre of 1255 with 1283 and count d' Armagnac and of Fézensac of 1255 with 1256. It was wire of the Jordan, lord of Chabanais, and Alix de Montfort, countess of Bigorre.

It succeeded his mother in 1255 and Maria the same year with Mascarose II, countess of Armagnac and Fézensac. The counties of Armagnac and Fézensac were always asserted by Géraud, Viscount of Fézensaguet. Death without child of Mascarose the following year put an end to the conflict, because its heir was this same Géraud, which became Géraud VI, count d' Armagnac.

It remaria shortly after with Ines de Foix, girl of Roger IV, count de Foix, and of Brunisende de Cardona, but he does not seem to have had children, because Bigorre returned then to his/her aunt Berthe de Mastas married to Gaston VII, Viscount of Béarn