Chiefs of Clan Buchanan

• 11th – Sir Walter Buchanan,[69][70] (Guthrie Smith identifies him as 5th Chief and Buchanan of Auchmar identifies him as 11th Chief) married Margaret and had three sons (Walter his successor, Alexander who reputedly killed the Duke of Clarence at the battle of Beaugé in 1421 and who later died in the battle of Verneuil in 1424, and John [Buchanan of Auchmar identifies him as 12th Chief ] who married Janet the heiress of Leny and was the first ancestor of the cadets of Leny) and two daughters (Elizabeth and Jean).

http://en.wikipedia.org/wiki/Clan_Buchanan