Founding of the Cistercian monastery of Oia Historical milestone · Oia, Baixo Miño, Pontevedra Image of Oia, not of the place itself. Alfonso VII endowed, around the mid-12th century, a monastic community on the coast of Oia that joined the Cistercian Order in 1185; the monastery came to control much of the coastline and to defend it with cannons against corsairs. 1132 Photo: Contando Estrelas from Vigo, España / Spain (CC BY-SA 2.0) What to see and do in Oia