Oronsay Priory was a monastery of canons regular on the island of Oronsay. It was in existence by 1353, perhaps founded by John of Islay, Lord of the Isles. It was dedicated to St. Columba, and perhaps was a continuation or a re-activation of an older foundation. Very little is known about it because of the absence of records and its remoteness from the Scottish Lowlands, but on occasions some of the Priors of Oronsay come into the records.
The priory continued in operation until at least 1560, the year of the Scottish Reformation, with the last known prior, Robert Lamont, having been elected in 1555. The lands and property of the priory were given in commendam to Maol Choluim MacDubhthaich in 1561. They were later given to the Bishop of the Isles by King James VI of Scotland after his ascendancy to the throne in 1583. The ruins have been restored and are visible today.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.