 The Metropolitan of Braga had canonical precedence over the diocese of Conímbriga, diocese of Viseu, diocese of Dume, diocese of Lamego, diocese of Porto and diocese of Egitânia (at present Idanha-a-Velha).The South of Portugal was under the Bishop of Evora and Lisbon.In the year 1052, the Bishop of Rome, claiming authority over all West, and adding the "Filioque" in the Nicene Creed, leading many (generally Orthodox) churches to leave communion with Rome.