 A contingent of the MacSweens eventually re-established themselves at Donegal as Gallowglass mercenary soldiers and became the progenitors of Clan Sweeney.Some of those who stayed on in Scotland formed into the Clan MacQueen, a branch of whom later joined the powerful Chattan Confederation.According to Niall Campbell, 10th Duke of Argyll, other MacSweens who remained in Scotland became known as the MacEwens of Otter, whose chiefly line may have become extinct in the 17th century.