Margaret Beauchamp of Bletso English noblewoman (1405–1482) Parents Edith Stourton John Beauchamp Children Sir John St. John Mary|Margaret St.John Margaret Beaufort Elizabeth St. John Edith St. John Mary St. John Oliver St. John Agnes St. John John Welles, 1st Viscount Welles Siblings Eleanor Shottisbrooke John Beauchamp Partners Lionel Welles, 6th Baron Welles John Beaufort, 1st Duke of Somerset Sir Oliver St. John