Sir John fitz John John, Sir, fitz John (c.1240–1275), baronial leader (1240–1275) Parents Isabel Bigod John Fitzgeoffrey Children Siblings Margaret de Lacy Maud de Lacy, Baroness Geneville Aveline fitz John Joan fitz John Maud FitzJohn, Countess of Warwick Richard fitz John, 1st and last Lord FitzJohn Isabel fitz John Walter de Lacy Partners Margery Basset