Caesar and Christ: A History of Roman Civilization and of Christianity from Their Beginnings to AD 325

The Age of Faith: A History of Medieval Civilization (Christian, Islamic, and Judaic) from Constantine to Dante, AD 325–1300

The Renaissance: A History of Civilization in Italy from 1304–1576 AD

Our Oriental Heritage

The Reformation: A History of European Civilization from Wycliffe to Calvin, 1300–1564

The Age of Reason Begins: A History of European Civilization in the Period of Shakespeare, Bacon, Montaigne, Rembrandt, Galileo, and Descartes: 1558–1648