15th – George Buchanan, (Guthrie Smith identifies him as 10th Chief and Buchanan of Auchmar identifies him as 17th Chief) succeed his grandfather, Walter 14th of Buchanan, in 1526 and died 1560. He first married Margaret Edmonstone and by her a son (John [Guthrie Smith identifies him as 11th Chief but then goes on to advise that the Chiefship passed from John's father to John's son and Buchanan of Auchmar identifies him as 18th Chief who married Elizabeth Livingston and by her had George who succeeded his grandfather) and two daughters (Helen and Susanna). Second he married Janet Cunningham and by her had a son (William first ancestor of the cadets of Auchmar) and a daughter (Margaret).