Through her grandfather, the Earl of Salisbury, she was a niece of Richard Neville, 16th Earl of Warwick (known in history as "Warwick, the Kingmaker"), and grandniece of Cecily Neville, Duchess of York (the mother of King Edward IV and King Richard III).
Elizabeth had nine siblings,[REF] including Lady Alice FitzHugh and Richard, 6th Baron FitzHugh (c.1456 - 20 Nov 1487) who married Elizabeth Burgh, daughter of Sir Thomas Burgh, 1st Baron Burgh of Gainsborough and his wife Margaret de Ros.