Joan Beaufort was the youngest of the four legitimised children and only daughter of John of Gaunt, 1st Duke of Lancaster, by his mistress, later wife, Katherine de Roet. Joan married Ralph de Neville
Richard Neville, 5th Earl of Salisbury, who displays the arms of Neville (tinctures transposed in error) with a label compony of Beaufort for difference. Salisbury Roll of Arms
Joan Beaufort and mother Katherine Swynford's tomb – 1809 drawing
The tomb of Joan Beaufort and her mother Katherine Swynford the presbytery of Lincoln Cathedral.
Ralph Neville, 1st Earl of Westmorland Earl Marshal, was an English nobleman of the House of Neville. Elevated to the earldom by Richard II, he later supported his brother-in-law Henry of Lancaster in
Ralph Neville, 1st Earl of Westmorland, wearing the Lancastrian Collar of Esses; detail of his effigy at Staindrop Church, County Durham
Alabaster effigy of Ralph Neville, 1st Earl of Westmorland with his two wives, Staindrop Church, County Durham, considered the finest sepulchral monument in the north of England. On his tunic he displays the arms of Neville; his head rests on a helm atop which is the bull's head crest of Neville
Richard Neville, 16th Earl of Warwick (1428–1471), "The Kingmaker", a grandson of Ralph Neville, 1st Earl of Westmorland, and Joan Beaufort. On his shield he displays his maternal arms of Montacute, but displays the Neville bull's head crest at sinister and stands on the same Neville heraldic beast
Wife 2