found: Work cat.: Perry, G. The Briennes, 2018:Publisher info. (The Briennes, an important aristocratic family from the Champagne region of north-eastern France, one of the great dynasties of the central Middle Ages, this book represents the first comprehensive history of the family) chapter 1 (Walter I, the first count of Brienne whom we know to have definitely borne that title)
found: Wikipedia, June 18, 2018(County of Brienne: The County of Brienne was a medieval county in France centered on Brienne-le-Château)
found: Britannica online, June 21, 2018:John, Byzantine emperor (John, byname John of Brienne, French Jean de Brienne, (born c. 1170--died March 1237, Constantinople, Byzantine Empire [now Istanbul, Turkey]), count of Brienne who became titular king of Jerusalem (1210--25) and Latin emperor of Constantinople (1231--37)) Isabella II, queen of Jerusalem (The daughter of John of Brienne and Mary (Marie) of Montferrat, Isabella inherited the throne on her mother's death in 1212, but her father ruled as regent and guardian and even continued to style himself as king (though he had been legally only king consort))
notfound: Dict. of Am. family names;Cent. pop. growth
