[4] There is no evidence to support a claim that a member of the family, 'Robert de Brix', served under William the Conqueror during the Norman Conquest of England.[5] This notion is now believed to have originated in unreliable lists, derived from the later Middle Ages, of people who supposedly fought at the Battle of Hastings.[8] However de Brus did not follow David and instead joined the English and at the Battle of the Standard in 1138 he took prisoner his own son, who was now Lord of the lands of Annandale.It was not long, however, before Balliol rebelled against Edward, eventually leading to John's defeat and forced abdication after the Battle of Dunbar in 1296.Robert the Bruce swore allegiance to Edward at Berwick-upon-Tweed but breached this oath when he joined the Scottish revolt the following year.Bruce and John Comyn (a rival for the throne) succeeded William Wallace as Guardians of Scotland, but their rivalry threatened the stability of the country.[9] The king escaped but left behind what was described as a magnificent example of Celtic jewellery, known as the Brooch of Lorne and it became one of the Clan MacDougall's great treasures.