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 Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.