Background
Beaumont was born in 1361 in the Duchy of Brabant, the only son of Henry Beaumont, 3rd Baron Beaumont (1340–1369) by his wife Margaret de Vere, daughter of John de Vere, 7th Earl of Oxford by his wife Maud de Badlesmere. His paternal grandparents were John Beaumont, 2nd Baron Beaumont (aft 1317–1342) and Eleanor of Lancaster (1318–1372), the fifth daughter of Henry, 3rd Earl of Lancaster (c1281–1345).
