Baron Beauchamp of Bletso was a title in the Peerage of England, created by writ when Roger de Beauchamp (died 1379/1380), son of Giles de Beauchamp and Catherine de Bures, was summoned to Parliament as the 1st Baron Beauchamp of Bletso from 1363 to 1379.
His son by his first marriage to Sybil de Patshull, another Roger Beauchamp (died 1373/1374), d.v.p. was not summoned to parliament. He married, secondly, Joan Clopton, daughter of Sir Walter Clopton.[1] Roger Beauchamp (died 1373/1374) was the father of Sir Roger Beauchamp (baptised 14 August 1362 at Bletso, died on 13 May 1406), who owned manors in Bletsoe, Bedfordshire, Spelsbury, Oxfordshire and Lydiard Tregoze, Wiltshire, and was knighted before 18 February 1393. He was Member of Parliament for Bedfordshire in 1399.
The son of Sir Roger Beauchamp (1362–1406) and his wife Mary was John Beauchamp of Bletso, born before 1396, who died in April 1412. He married, firstly, in January 1405/1406, Margaret Holand, daughter of Sir John Holand, and secondly, after 1406, Edith Stourton, daughter of Sir John Stourton, Sheriff of Dorset and Somerset, and Catherine Beaumont, daughter of Henry Beaumont, 3rd Baron Beaumont and Lady Margaret de Vere.[2]
With Edith Stourton, John Beauchamp had two children, another John Beauchamp (born about 1410, died in childhood) and Margaret Beauchamp, the family's ultimate heiress, who was born in 1406 and died on 8 August 1482. After the death of her first husband, Sir Oliver St John (died 1437), she married John Beaufort, 1st Duke of Somerset (1404–1444).[3] Margaret Beauchamp's great-great-great-grandson by her first marriage was created Baron St John of Bletso in 1582.