 In 1425 the ninth chief, James Galbraith of Culcreuch, joined the rebellion of James Mor Stewart against King James I of Scotland, in support of the overthrown regent Murdoch Stewart, Duke of Albany.As many as 600 members of the clan were forced to flee after the failure of the revolt, exiled to Kintyre and the Isle of Gigha, where they adopted the new name of MacBhreatneaich of M'Vretny ("son of the Briton").In 1489 the twelfth chief, Thomas Galbraith of Culcreuch, was captured by James IV and hanged.