[2] It is a co-cathedral diocese, with cathedras in the Cathedral St-Jean-Baptiste d' Aire[3] and in Nôtre Dame de Dax.

[4][5] The first reference to a bishop of Aire, on the river Adour, in history is to Marcellus, represented at the Council of Agde, 506.

[1] Aire was also the home of St. Philibert; it numbered among its bishops during the second half of the sixteenth century François de Foix, Count of Candale, an illustrious mathematician, who translated Euclid and founded a chair of mathematics at the University of Bordeaux,[1] though he never visited his diocese.

In 1572, on the death of Bishop Christophe de Candale, the Capitular Vicar of Aire submitted a status report (pouillé) to King Charles IX, providing a picture of the diocese at that time.

In addition to the two archdeacons, the Cathedral Chapter was composed of ten Canons and seven Prebendaries, two semi-Prebendaries, the Master of the Children of the Choir, and the Basse-Contre.