feudal baron of Hatch Beauchamp in Somerset, who brought to her husband the greater part of her father's extensive estates in Somerset, Devon, Buckinghamshire and Suffolk. The eldest son of this marriage was Sir William St. Maur (d.1390), or Seymour (the modernised form of the name appears to have come into use about this date), who was an attendant on the Black Prince, and who died in his mother's lifetime, leaving a son Roger St Maur (c.1366-1420), who inherited his grand-mother's estates and added to them by his marriage with Maud Esturmy, daughter of Sir William Esturmy (died 1427) of Wolf Hall, Wiltshire.