Ranald, son of the Lord of the Isles, was the progenitor of this famous branch of the Clan Donald. They had the reputation of being fierce and warlike and their history is a turbulent one. They frequently engaged in clan feuds and at the Battle of Blar-na-leine in 1544 defeated the Clan Fraser. They followed Montrose in his campaign in the 17th century and they participated in the Jacobite Risings of 1715 and 1745. When Prince Charlie raised his standard at Glenfinnan in September 1745 he did so in Clanranald territory. Castle Tirim was the ancient fortress of the Clanranalds.