History and Legends
Sir Gilbert Hay was personal friend and comrade-in-arms to the 14th century Scottish King Robert the Bruce. In recognition and reward for his many years of faithful service, Sir Gilbert was given the honorary hereditary title of Lord High Constable of Scotland (a title is still carried today) and was given the titles to the lands of Slains, Aberdeenshire. He was Ambassador to England after Bannockburn in 1314.
more on Sir Gilbert here