Among the issues that continue to divide the Catholic Church from the Orthodox Church-the two largest Christian bodies in the world, together comprising well over a billion faithful-the question of the papacy is widely acknowledged to be the most significant stumbling block to their unification. For nearly forty years, commentators, theologians, and hierarchs, from popes and patriarchs to ordinary believers of both churches, have acknowledged the problems posed by the papacy. In Orthodoxy and the Roman Papacy: Ut Unum Sint and the Prospects of East-West Unity, Adam A. J. DeVille offers the...