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- Henry Beaumont, 1st Earl of Buchan was the son of Louis de Brienne and Agnes, Vicountesse de Beaumont.
He married Alice Comyn, daughter of Sir Alexander Comyn and Joan Latimer, before 14 July 1310.
Children of Henry Beaumont, 1st Earl of Buchan and Alice Comyn
1. Catherine de Beaumont d. 11 Nov 1368
2. Elizabeth Beaumont d. 27 Oct 1400
3. Richard Beaumont
4. John Beaumont
5. Thomas Beaumont
6. Alice Beaumont
7. Joan Beaumont
8. Beatrice Beaumont
9. John de Beaumont, 2nd Lord Beaumont b. c 1317, d. bt 10 May 1342 - 25 May 1342
10. Isabella de Beaumont b. c 1320, d. 1361
He died before 10 March 1339/40. His will was proven (by probate) in January 1342 at Lincoln, Lincolnshire, England.
He fought in the Scottish Wars in 1302, with King Edward I.
He was appointed Knight before 1308.
He held the office of Joint Warden of Scotland (south of Forth) in 1308.
In 1307/8 he was granted large estates in Lincolnshire.
He was created 1st Lord Beaumont [England by writ] on 4 March 1308/9.
He held the office of Lordship of the Isle of Man between 16 March 1310 and 20 October 1312.
He held the office of Envoy to France between 1312 and 1331.
In 1312/13 he had livery of lands from John Comyn, Earl of Buchan.
He fought in the Battle of Bannockburn on 24 June 1314.
He held the office of Constable of England in 1322.
He was appointed Privy Counsellor (P.C.) in 1322.
He fought in the Battle of Boroughbridge on 16 March 1321/22.
On 5 June 1323 he was imprisoned for contempt and disobedience at the Council.
In 1334 he received a grant of Loughborough Castle, for siding against the King and preventing the King's escape.
He was created 1st Earl of Buchan [England by writ] on 22 January 1333/34.
He held the office of Constable of England in 1336.
He held the office of Justiciar [Scotland] in 1338.
His descendants appear not to have used the title of Earl of Buchan.
http://thepeerage.com/p10288.htm#i102873
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Henry de Beaumont (before 1280 – 10 March 1340), jure uxoris 4th Earl of Buchan and suo jure 1st Baron Beaumont, 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 later known as the 'disinherited' — Englishmen whose Scottish lands had been forfeited — 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.
Origins
Henry de Beaumont was the eldest son of Louis of Brienne, (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 by his third wife, Berengaria of Leon, making him a second cousin of Edward II. His brother Lewis de Beaumont was Bishop of Durham and his sister Isabella was wife of the prominent noble John de Vesci.
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... he died in March 1340, his long struggle incomplete. His son, John, never claimed the lost earldom of Buchan. When Beaumont's wife, Alice, died in 1349 the Comyn line of Buchan, which stretched back to the early thirteenth century, finally came to an end.
By the time an Inquisition was held to assess his lands in April 1340, Henry was holding a large amount of land in Lincolnshire as well as smaller areas in Leicestershire, Northumberland and Yorkshire.
Marriage and children
Shortly before 14 July 1310 he married Alice Comyn, Countess of Buchan (died 3 July 1349), the niece and heiress of John Comyn, Earl of Buchan (and granddaughter of Alexander Comyn, Earl of Buchan Lord High Constable of Scotland). He was recognised as Earl of Buchan jure uxoris.
By Alice he had children including:
1. Elizabeth Beaumont (c. 1320 – 1400) who married Nicholas Audley, 3rd Baron Audley (1328–1391), without children.
2. John de Beaumont, 2nd Lord Beaumont (c. 1318), who married Eleanor of Lancaster, great-granddaughter of King Henry III and a sister of Henry of Grosmont.
3. Isabel de Beaumont, married Henry of Grosmont, 1st Duke of Lancaster, brother of Eleanor of Lancaster. They were ancestors of the English Royal House of Lancaster, with King Henry IV of England being the couple's grandson.
4. Katherine de Beaumont, married David III Strathbogie, titular Earl of Atholl, 1st Lord Strathbogie
5. Joan de Beaumont, who ("it is said") married Fulk VII FitzWarin, 3rd Baron FitzWarin (died 1349), of Whittington Castle in Shropshire and Alveston in Gloucestershire.
https://en.wikipedia.org/wiki/Henry_de_Beaumont
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1270 - 1340 (70 years)
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