Castle Sween
| Castle Sween | |
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| Achnamara, Loch Sween, Knapdale, Argyll, Scotland | |
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 Castle Sween
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| Coordinates | 55°56′52″N 5°39′55″W / 55.9479°N 5.6654°W |
| Type | Castle |
| Site information | |
| Owner | Historic Scotland |
| Site history | |
| Built | 12th Century |
| Built by | Suibhne |
Castle Sween is located on the eastern shore of Loch Sween, in Knapdale, south of the forestry village of Achnamara on the west coast of Argyll, Scotland. 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.
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