Heart of Europe: A History of the Holy Roman Empire
The Normans in the South, 1016–1130 (The Normans in Sicily)
A History of the Crusades Vol. I: The First Crusade and the Foundations of the Kingdom of Jerusalem (Volume 1)
Sicily: An Island at the Crossroads of History
The Kingdom in the Sun, 1130–1194 (The Normans in Sicily)
The Fall of Constantinople 1453 (Canto Classics)
Black Reconstruction in America, 1860-1880
The Great Church in Captivity: A Study of the Patriarchate of Constantinople from the Eve of the Turkish Conquest to the Greek War of Independence
The Medieval Manichee: A Study of the Christian Dualist Heresy