Sir Alexander Buchanan was the eldest of the three sons of Sir Walter Buchanan, eleventh Laird of Buchanan.

Battle of Baugé

Sir Alexander fought in the Battle of Baugé

Battle of Baugé

The Battle of Baugé, fought between the English and the Franco-Scots on 21 March 1421 in Baugé, France, east of Angers, was a major defeat for the English in the Hundred Years' War...

 on 21 March, 1421, in which the Kingdoms of Scotland and France fought and won against the Kingdom of England - a major defeat for the English during the Hundred Years' War. The English were led by Thomas of Lancaster, 1st Duke of Clarence

Thomas of Lancaster, 1st Duke of Clarence

Thomas of Lancaster, 1st Duke of Clarence, KG , also known as Thomas Plantagenet, was the second son of King Henry IV of England and his first wife, Mary de Bohun. He was born before 25 November 1387 as on that date his father's accounts note a payment made to a woman described as his nurse...

, second son of King Henry IV of England

Henry IV of England

Henry IV was King of England and Lord of Ireland . He was the ninth King of England of the House of Plantagenet and also asserted his grandfather's claim to the title King of France. He was born at Bolingbroke Castle in Lincolnshire, hence his other name, Henry Bolingbroke...

 and his first wife, Mary de Bohun

Mary de Bohun

Mary de Bohun was the first wife of King Henry IV of England and the mother of King Henry V. Mary was never queen, as she died before her husband came to the throne.-Early life:...

 and brother of the current King, Henry V of England

Henry V of England

Henry V was King of England from 1413 until his death at the age of 35 in 1422. He was the second monarch belonging to the House of Lancaster....

. During the battle Sir John Carmichael of Douglasdale broke his lance unhorsing the Duke of Clarence. Once on the ground, the Duke was slain by Sir Alexander. Sir Alexander held the prince's coronet aloft on his lance, bringing such dismay to the English that the battle was lost to them. In recognition of this the Clan Buchanan

Clan Buchanan

Clan Buchanan is an Armigerous Scottish clan whose origins are said to lie in the 1225 grant of lands on the eastern shore of Loch Lomond to clergyman Sir Absalon of Buchanan by the Earl of Lennox.-Origins:...

coat of arms to this day depicts a ducal coronet being held up in triumph.

Issue

Sir Alexander died without issue and his father, Sir Walter Buchanan, eleventh Laird of Buchanan, was succeeded by his second son, Sir Walter Buchanan, twelfth Laird of Buchanan.