 In the 13th century the MacSweens controlled lands across central Argyll, extending as far north as Loch Awe and as far south as Loch Fyne.Their principal seats included Lochranza Castle on the Isle of Arran, Skipness Castle and Castle Sween at Knapdale, which may be Scotland's oldest surviving stone-built castle.The MacSweens held this lordship of Knapdale and lands in Kintyre until 1262.