Which woman was the sister of XXX?
Jeanne d'Angoulême
Jeanne d'Angoulême, Countess of Bar-sur-Seine (ca. 1490 -- after 1531/1538), Dame de Givry, Baroness of Pagny and of Mirebeau, was an illegitimate half-sister of King Francis I of France and princess Marguerite de Navarre.
Marguerite de Navarre