Anne Neville (Stafford), duchess of Buckingham,
Ownership Possible (?-1480) by Inscription.
Joan Beaufort, countess of Westmorland,
Ownership Possible (c.1415-pre-1440) by Other.
Tuck, Anthony. "Beaufort [married names Ferrers, Neville], Joan, countess of Westmorland (1379?–1440), magnate," in Oxford Dictionary of National Biography (2008).
Edwards, A. S. G. "Northern Magnates and Their Books," Textual Cultures 7, no. 1 (2012): 176-86.