Kenneth M. Setton
From the New York Times, February 23, 1995:
Dr. Kenneth M. Setton [was] one of the foremost interpreters of medieval Europe and the Crusades, the papacy and the dawn of the Renaissance[.] Dr. Setton spent nearly two decades finishing his four-volume "The Papacy and the Levant, 1204-1571" (American Philosophical Society, 1976-1984). A classic study of the era, it remains in print.