Duchess Isabella of Brienne (1306- 1360) was Countess of Lecce and Conversano, claimant to the Duchy of Athens and Kingdom of Jerusalem, etc.
She was daughter of Walter V of Brienne, Duke of Athens, who was killed at the Battle of Halmyros near Thebes, Greece, in 1311. As the granddaughter of Hugh of Brienne, Count of Lecce etc, she was a descendant of the Kings of Jerusalem and of Cyprus.
Her children were:
1. Walter of Enghien (June 5, 1322 – November 18, 1340)
2. Isabeau of Enghien (d. December 28, 1357), Abbess of Flines
3. Sohier of Enghien (d. March 21, 1364), Count of Brienne, titular Duke of Athens.
4. John of Enghien, (d. 1380), Count of Lecce and Lord of Castro
5. Marguerite of Enghien, married Pierre de Préaux
6. Louis of Enghien (d. March 17, 1394), Lord (later Count) of Conversano, later Count of Brienne and titular Duke of Athens. Married Giovanna of Sanseverino, by whom he had four daughters, including his heiress, Marguerite, who in her own turn married John of Luxembourg, Sire of Beauvois. Mary, Queen of Scots and Queen consort Elizabeth Woodville were notable descendants.
7. Jacques of Enghien, a canon in Liège
8. Guy of Enghien,(d. 1377), Lord of Argos and Nauplia
9. Engelbert I of Enghien (c. 1330–February 20, 1403), Lord of Ramerupt, La Follie, and Seneffe
10. Françoise of Enghien, married Peter, Count of Montebello
11. Jeanne of Enghien, a nun at Flines
Isabel de Brienne 
