The fairly intact remains of an Augustinian priory survives, and as with many such foundations in Ireland, it is understood to be built on the site of a pre-existing Celtic monastery. In this case said to have been founded by St Columba, with a tradition that he moved on from here because he could still see Ireland. First mentioned in records in 1353. It was closed in 1616 as part of the Scottish Reformation. There are a number of crosses on the site. The largest is known as the Oronsay Cross and has an image of the Crucifixion with interlacing work around. It bears an inscription that says it was the cross of Prior Colin, who died in 1510.