Old Common Council of Castropol, also Eo-Navia Land, Entrambasauguas or Honor de Suarón and Grandas[1] is the name that was historically given to the sixteen westernmost villages of Asturias located between the Eo and Navia rivers.
These villages belonged to the sixth sección or party (known as 'Episcopalias') that made up the Junta General del Principado, the historical governing body of Asturias.
Episcopalías was composed by the following villages or concejos: Castropol, Rivera de Abajo, Rivera de Arriba, Langreo, Llanera, Quirós, Teverga, Noreña, Las Regueras, Navia, Morcín, Tudela, Proaza, Santo Adriano, Pajares [es], Riosa, Olloniego, Yernes y Tameza, Bimenes, Paderni, Sobrescobio and Peñaflor.
During the Roman Empire, the villages belonging to the region were linked to the parish of Britonia within the Lucensis Conventum, however, in 812, as a consequence of the Muslim invasion, King Alfonso II agreed to incorporate the Diocese of Britonia into the Diocese of Oviedo, which had no antecedents, but which had several monasteries in Asturias, such as the one in the city of Oviedo itself.
[3].During the second half of the 12th century, the region came under the direct influence of the bishopry of Oviedo as a result of an 1154 land grant by Fernando II of León.