Castle Sween is thought to be one of the earliest stone castles built in Scotland, having been built sometime in the late twelfth century. The castle's towers were later additions to wooden structures which have now since vanished.
Castle Sween takes its name from Suibhne, whose name was Anglicised as 'Sween'. He was thought to have built the castle. Suibhne was thought to have been a grandson of Hugh the Splendid O'Neill who died in 1047. In the thirteenth century, the Clan MacSween governed lands extending as far north as Loch Awe and as far south as Skipness Castle on Loch Fyne. In the later half of the thirteenth century the MacSween lands of Knapdale passed into the hands of the Stewart Earls of Menteith.
By the time of the Wars of Scottish Independence the MacSweens entered into the service of King Edward I of England in the hope of recovering their lands from the Earl of Menteith, however when Robert the Bruce became King of Scotland he displaced the MacSweens from their lands. After Robert the Bruce had defeated MacDougall Lord of Lorne in 1308, he then laid siege to Alasdair Og MacDonald in Castle Sween. Alastair gave himself up and was disinherited by Robert Bruce who then granted Islay to Alasdair's younger brother, Angus Og, the king's loyal supporter, who also received the Castle Sween in Kintyre from the King.
In 1310, Edward II of England granted John MacSween and his brothers their family's ancestral lands of Knapdale, (though by then Castle Sween was held by Sir John Menteith). It is possible that this could be the 'tryst of a fleet against Castle Sween', recorded in the Book of the Dean of Lismore, which tells of the attack of John MacSween on Castle Sween.
In 1323, after the death of Sir John Menteith, the Lordship of Arran and Knapdale passed to his son and grandson. In 1376 half of Knapdale, which included Castle Sween, passed into possession of the MacDonald Lords of the Isles, by grant of Robert II of Scotland to his son-in-law John I, Lord of the Isles.
In 1647, during the Wars of the Three Kingdoms, Castle Sween was attacked and burnt by Alasdair MacColla and his Irish Confederate followers.
References:Saint-Georges de Boscherville Abbey is a former Benedictine abbey. It was founded in about 1113 by Guillaume de Tancarville on the site of an earlier establishment of secular canons and settled by monks from the Abbey of Saint-Evroul. The abbey church made of Caumont stone was erected from 1113 to 1140. The Norman builders aimed to have very well-lit naves and they did this by means of tall, large windows, initially made possible by a wooden ceiling, which prevented uplift, although this was replaced by a Gothic vault in the 13th century. The chapter room was built after the abbey church and dates from the last quarter of the 12th century.
The arrival of the Maurist monks in 1659, after the disasters of the Wars of Religion, helped to get the abbey back on a firmer spiritual, architectural and economic footing. They erected a large monastic building one wing of which fitted tightly around the chapter house (which was otherwise left as it was).