Leo Donald Davis, S.J., (1930-2014), received an S.T.L. from the Gregorian University, Rome, and his Ph.D. from the University of Wisconsin. He taught at Xavier University, Cincinnati, and Weston School of Theology. He wrote articles and reviews in Traditio, New Scholasticism, Theological Studies, and Catholic Historical Review.

This unique work-no other work yet available in English treats this subject-illustrates the contribution of these Councils in the development and formulation of Christian beliefs. It then shows how their legacies lingered throughout the centuries to inspire-or haunt-every generation.