Roger Mortimer, 1st Earl of March on 22 May 1306, in a lavish ceremony in Westminster Abbey with two hundred and fifty-nine others, he was knighted by Edward and granted livery of his full inheritance. His adult life began in earnest in 1308, when he went to Ireland in person to enforce his authority. This brought him into conflict with the de Lacys, who turned for support to Edward Bruce, brother of Robert Bruce, King of Scots. Mortimer was appointed Lord Lieutenant of Ireland by Edward II on 23 November 1316. Shortly afterwards, at the head of a large army, he drove Bruce to Carrickfergus and
Niall mac Cailein Dovenald Chambel and Sir Nel Chambel by their lands and bodies". In the same year, Edward granted some Campbell lands to an English knight, Sir John Dovedale. Such judgments were both a cause and effect of deteriorating relations with the English crown. So when Robert decided to rebel in 1306, it is not surprising that Niall and Domhnall were among the would-be king's first adherents. Niall was present at Scone in March 1306 when Robert was crowned King of Scots. After the defeats Robert suffered at the Battle of Methven and Battle of Dalrigh, Niall was one of the men