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Son of Sir Roger St. Maur and Cecilia Beauchamp Brother of Roger Seymour; William Seymour, MP; John Seymour and Lettice Seymour Half brother of Juliana de Turberville and Elizabeth Morton
S De Brockbury is not a son of Roger Seymour and Cecilia Beauchamp. Their son William did marry Margaret Brockbury, daughter of Simon de Brockbury.