Henry de Beaumont, 4th Earl of Buchan

Henry de Beaumont
4th Earl of Buchan & 1st Baron Beaumont
Arms of Beaumont: Azure semée of fleurs-de-lis, a lion rampant or
Born	bef. 1280 France
Died	10 March 1340
Noble family	Brienne
Spouse(s)	Alice Comyn, Countess of Buchan
Father	Louis de Brienne
Mother	Agnès de Beaumont

Henry de Beaumont, jure uxoris 4th Earl of Buchan and suo jure 1st Baron Beaumont (bef. 1280 - 10 March 1340) was a key figure in the Anglo-Scots wars of the thirteenth and fourteenth centuries, known as the Wars of Scottish Independence.

Henry de Beaumont was a veteran campaigner who participated in every major engagement, from the Battle of Falkirk in 1298 to the Battle of Halidon Hill in 1333. Although not now a widely known figure, he was, nevertheless, of considerable military and political importance. His long experience of the Scottish wars led him to develop a battle technique later used to great effect at Crécy and Agincourt. As one of a group of Anglo-Scots nobles known as the 'disinherited' — those who had fought against King Robert Bruce — he was to do much to overturn the peace between England and Scotland established by the Treaty of Northampton and bring about a Second War of Scottish Independence. By his marriage shortly before 14 July 1310 to Alice Comyn, Countess of Buchan (died 3 July 1349), the niece and heir of John Comyn, Earl of Buchan, he was recognised as Earl in right of his wife.

Henry de Beaumont was the eldest son of Sir Louis de Brienne, Knt., (d. after 1 September 1297) who was in right of his wife Agnès de Beaumont, Vicomte of Beaumont in Maine and Seigneur of Beaumont-le-Vicomte (alias Beaumont-sur-Sarthe), Sainte-Suzanne, la Fleche, Fresnay, le Lude, etc. He was the grandson of John of Brienne, King of Jerusalem and great-grandson of King Alfonso IX of León making him and Edward II second cousins. His brother Lewis de Beaumont was Bishop of Durham and his sister Isabella was wife of the prominent noble John de Vesci.