Thomas Beaufort, Duke of Exeter

The Duke of Exeter
Coat of arms of Thomas Beaufort, Duke of Exeter
Spouse(s)	Margaret Neville of Horneby
Noble family	Beaufort
Father	John of Gaunt, 1st Duke of Lancaster
Mother	Katherine Swynford
Born	c. 1377 Château de Beaufort, Anjou
Died	31 December 1426(1426-12-31) (aged c. 49)
Occupation	Lord Chancellor; Lord High Admiral

Thomas Beaufort, 1st Duke of Exeter KG (c. 1377 – c. 31 December 1426) was an English military commander during the Hundred Years' War, and briefly Chancellor of England. He was the third of the four children born to John of Gaunt, Duke of Lancaster, and his mistress Katherine Swynford. To overcome their problematic parentage, his parents were married in 1396, and he and his siblings were legitimated on two separate occasions, in 1390 and again in 1397. He married the daughter of Sir Robert Neville (d. 1413) of Hornby, Margaret Neville, who bore him one son, Henry Beaufort. However, the child died young.

After the accession of his half-brother Henry IV, Beaufort was made a Knight of the Garter. In the following years he held various military posts: constable of Ludlow (1402), admiral of the fleet for the northern parts (1403), captain of Calais (1407), and admiral of the northern and western seas for life (1408/9). His most notable action during this decade was commanding the forces against the northern rebellion of 1405.

He became Chancellor of England on 31 January 1410, an office he held until 5 January 1412 during a time when King Henry was having trouble with the clergy, and then returned to military matters. Later in 1412 he was created Earl of Dorset.

On the accession of Henry V, Beaufort was appointed Lieutenant of Aquitaine (1413) and then captain of Harfleur (1415). He spent the next years in Normandy as Lieutenant of Normandy (1416). He was created Duke of Exeter for life in 1416.