The former Roman Catholic Diocese of Oloron was a Latin rite bishopric in Pyrénées-Atlantiques department, Aquitaine region of south-west France, from the 6th to the 19th century. History The diocese of Oleron already existed in the 6th century, when Bishop Gratus attended the Council of Agde. The diocese of Oleron was a suffragan (provincial subordinate) to the Archdiocese of Eauze, holding the eighth place of nine, until Eauze was destroyed by the Normans around 845. It then became a suffragan of Auch, which was raised to the status of a metropolitan archbishopric in 847. For administrative purposes the diocese was subdivided (by the thirteenth century) into six archdeaconries, those of Oleron, Soule, Navarrenx, Garenz, Aspe, and Lasseube. The archdeaconries and archpriesthoods disappeared in the sixteenth century, when Béarn was protestantized by the official policy of the royal house of Navarre, especially by Jeanne d'Albret. The bishops of Oleron were also seigneurs of the Barony of Moumour, thanks to the liberality of Gaston V, Viscount of Béarn (died 1170). Cathedral Chapter The Chapter of the Cathedral of Sainte-Marie was composed of twelve Canons and eight prebendaries. The Bishop and Chapter were jointly seigneurs of the town of Sainte-Marie, on the opposite bank of the river Gave from Oloron, where the episcopal palace was located. There was also the Collegiate Church of Sainte-Engrâce, which had been founded in the mid-11th century. It had a Chapter composed of a Sacristan and twelve non-residential Canons. Bishop and Papal Legate Bishop Amatus (1073? – 1089), who had been a Benedictine monk, presided as Legate of Pope Gregory VII in a Council held at Poitiers on 26 May 1075, to deal with the marital irregularities of Count Guillaume of Poitou. He was also present, with the title of Legate, at the Council of Poitiers held by the Papal Legate Hugh of Die in 1078. He presided as Papal Legate at a Council held at Gerona in Aragon in 1078, and, again with Hugh de Die, at the Council of Bordeaux in December 1079. In December 1079 Pope Gregory VII appointed him Legate to Britain. On 6 October 1080, Amat and Hugh presided at another council at Bordeaux; and likewise in the same year at Saintes, and likewise on 27 March 1181 at Issoudun (Exoldunense). The reward for this very busy and loyal bishop was a promotion to the Archbishopric of Bordeaux (1089-1102). Election of 1246 Late