Joan de Beauchamp 
Joan's father was Sir Thomas de Beauchamp, 11th Earl of Warwick and her mother was Katherine Mortimer. Her paternal grandparents were Guy de Beachamp, 10th Earl of Warwick and Alice de Toni; her maternal grandparents were Roger de Mortimer and Baroness Joan de Geneville. She had a brother and two sisters, named Thomas, Philippa and Maud.General Notes
"The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant" says she died without issue.
"The Magna Charta Barons and Their American Descendants 1898" by Charles H. Browning says Jane Basset is the daughter.
