 Robert is the ancestor of the Aberdeenshire branch of the Clan Maitland, whose senior line lived at Balhargardy near Inverurie.William's successors were styled as "of Letherington", while the eldest son John became involved in the conspiracies of George Dunbar I, Earl of March who was his kinsman.William's son, Robert Maitland, surrendered Dunbar Castle to the Earl of Douglas and as a result escaped from being involved in the ruin of his uncle, John.