There is evidence of archaeological finds dating back from the Paleolithic period. The forts on the island of Ons, Castrillon (Meiro), Bon (Beluso) and A Cividade are all of the Bronze Age. Subsequently are the Roman settlements of Pescadoira (recently excavated) and Meiro, with the altar stones dedicated to the Lares road.
Only by the age of the temples in Bueu we can approach the time when it became a parish. It is known that Bueu had a temple before the fourteenth century. In Beluso there is data concerning a cession in 1008. The Church of Cela is from the twelfth century. The old Hermelo priory had a temple in the twelfth century.