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 years. A team of researchers, headed by Professor Andrew Nelson from University of Western Ontario have determined that Robert the Bruce did not have leprosy. They examined the original casting of the skull belonging to Robert the Bruce's descendant Lord Andrew Douglas Alexander Thomas Bruce, and a foot bone that had not been re-interred. They determined that skull and foot bone showed no signs of leprosy, such as an eroded nasal spine and a pencilling of the foot bone. The king's body was embalmed, and his sternum sawn open to allow extraction of the heart, which Sir James Douglas placed