Question: Where is the cathedral in France dedicated to the first verifiable bishop of Aix-en-Provence ?

text: List of cathedrals in France
Roman Catholic cathedrals

This is a list of cathedrals in France and in the French overseas departments, territories and collectivities, including both actual and former diocesan cathedrals (seats of bishops). Almost all cathedrals in France are Roman Catholic, but any non-Roman Catholic cathedrals are listed here as well. The list is intended to be complete as far as current cathedrals and co-cathedrals are concerned. It is not yet an exhaustive list of former cathedrals, although it includes most of them. A number of large churches in France are known as cathedral as a mark of distinction or historical importance but have never been the seats of bishops. These are not included here.
Cathedral Archdiocese or Diocese Location Dedication Notes
Agde Cathedral Cathédrale Saint-Étienne d'Agde Montpellier Agde Saint Stephen former cathedral ( bishopric suppressed in 1801 )
Agen Cathedral Cathédrale Saint-Caprais d'Agen Agen Agen Saint Caprasius cathedral ; World Heritage Site
Aire Cathedral Cathédrale Saint-Jean-Baptiste d'Aire Aire et Dax Aire-sur-l'Adour Saint John the Baptist cathedral
Aix Cathedral Cathédrale Saint-Sauveur d'Aix Aix Aix-en-Provence Holy Saviour cathedral , minor basilica
Ajaccio Cathedral Cathédrale Notre-Dame-de-l'Assomption d'Ajaccio Ajaccio Ajaccio Assumption of the Blessed Virgin Mary cathedral
Albi Cathedral Cathédrale Sainte-Cécile d'Albi Albi Albi Saint Cecilia cathedral , minor basilica
Alès Cathedral Cathédrale Saint-Jean-Baptiste d'Alès Nîmes Alès Saint John the Baptist former cathedral ( bishopric suppressed in 1801 )
Alet Cathedral Cathédrale Notre-Dame d'Alet Carcassonne et Narbonne Alet-les-Bains Blessed Virgin Mary former cathedral ruins ( ruined in 1577 and finally demolished in 1776 ; bishopric suppressed in 1801 )
Aleth Cathedral Cathédrale Saint-Pierre d'Aleth Rennes Saint-Servan Saint Peter former cathedral ruins ( replaced by Saint-Malo Cathedral in 1146 and destroyed in 1255 )
Amiens Cathedral Cathédrale Notre-Dame d'Amiens Amiens Amiens Blessed Virgin Mary cathedral , minor basilica ; World Heritage Site
Angers Cathedral Cathédrale Saint-Maurice d'Angers Angers Angers Saint Maurice cathedral
Angoulême Cathedral Cathédrale Saint-Pierre d'Angoulême Angoulême Angoulême Saint Peter cathedral
Annecy Cathedral Cathédrale Saint-Pierre d'Annecy Annecy Annecy Saint Peter cathedral
Antibes Cathedral Cathédrale Notre-Dame-de-la-Platea d'Antibes Nice Antibes Blessed Virgin Mary Notre-Dame de la Platéa former cathedral ( bishopric suppressed in 1801 )
Apt Cathedral Cathédrale Sainte-Anne d'Apt Avignon Apt Saint Ann former cathedral ( bishopric suppressed in 1801 )
Arles Cathedral , now Church of St. Trophime , Arles Cathédrale Saint-Trophime d'Arles Aix Arles Saint Trophimus former cathedral ( archbishopric suppressed in 1822 ) ; minor basilica
Arras Cathedral Cathédrale Notre-Dame-et-Saint-Vaast d'Arras Arras Arras Blessed Virgin Mary and Saint Vedast cathedral , minor basilica
Auch Cathedral Cathédrale Sainte-Marie d'Auch Auch Auch Saint Mary cathedral , minor basilica ; World Heritage Site
Autun Cathedral Cathédrale Saint-Lazare d'Autun Autun Autun Saint Lazarus of Aix cathedral ( built in the 12th century ) , minor basilica
Old Autun Cathedral Cathedrale Saint-Nazaire d'Autun Autun Autun Saint Nazarius former cathedral , 5th-12th centuries