Parc de la Cité d'Alet

Aleth Cathedral (French: Cathédrale Saint-Pierre d'Aleth) was a Roman Catholic church located in Saint-Servan in Saint-Malo, Brittany, France. It was the cathedral of the diocese of Aleth.Aleth was a Gallo-Roman settlement on a peninsula on one side of the Rance estuary. The diocese was established in the 9th century.