The ancient territory of the diocese of Britonia Most of what is known about the settlement comes from ecclesiastical sources; records from the 572 Second Council of Braga refer to a diocese called the "Britonensis ecclesia" ("British church") and an episcopal see called the "sedes Britonarum" ("See of the Britons"), which was likely the monastery of Santa Maria de Bretoña. occupied mainly the coastal strip from the Lugo's coast to the Terra Chá, reaching his influence to the region of the Eo-Navia from the east and the west of Ferrol. Its ancient headquarters, known under the name "Maximus Monastery" was identified by some authors with the medieval Basilica of Saint Martin of Mondoñedo, were remnants of 5th–6th centuries. Changed its name and its headquarters on several occasions, currently the Galician diocese of Mondoñedo is its historical successor.