Widow of Thomas FitzJohn (FITZGERALD), EARL OF KILDARE, and 4th dau. of Richard (DE BURGH), EARL OF ULSTER.
She is confirmed as Elizabeth's mother by the statement that her grandson, James Butler, earl of Ormond (d. 1452), and his wife Elizabeth FitzGerald were related on the side of their fathers in the 3rd degree of kindred [Douglas Richardson, June 2002, citIng Calendar of Papal Letters, vol. 8, pp. 442, 443]. It seems that the only possibly route for this relationship is through a common descent from Joan de Burgh, who was ancestress of the FitzGeralds through her previous marriage.