Clan Donnachaidh the Battle of Methven in 1306. The clan asserts that Stout Duncan's relatives and followers (not yet known as Robertsons) supported Robert the Bruce at the Battle of Bannockburn in 1314. His descendants became known (in English or Scots) as the Duncansons, or Gaelic "Clann Dhònnchaidh", "Children of Duncan". Duncan is believed to have been killed at the Battle of Neville's Cross and was succeeded by Robert, from who the Clan Robertson takes its name. Robert's brother, Patrick, was the ancestor of the Robertsons of Lude who were the principal cadet branch. In 1394 a clan battle took place between
Robert the Bruce between English and Scottish occupation. Eventually it was defeated when Edward Bruce was killed at the Battle of Faughart. The Irish Annals of the period described the defeat of the Bruces by the English as one of the greatest things ever done for the Irish nation due to the fact it brought an end to the famine and pillaging wrought upon the Irish by both the Scots and the English. The reign of Robert Bruce also included some significant diplomatic achievements. The Declaration of Arbroath of 1320 strengthened his position, particularly in relation to the Papacy, and Pope John XXII