Early in the fourth century Constantine made Christianity the religion of the Roman Empire, and at once had reason to regret his having done so; for now not only the Church but the state was convulsed by controversies about the Holy Trinity. These controversies raged for over two hundred years, after which the bishops found new intellectual outlets, if not more rational ones, for their animosities. But Trinitarian trouble was not dead, only sleeping. The Great Schism of the eleventh and (...) twelfth centuries, which split the Western from the Eastern Church, took place, on its theological side, over a question concerning the Trinity. This was, of course, that most famous of all theological questions, the question of the procession of the Holy Ghost, or of the filioque. The Orthodox theory was that the Holy Ghost proceeds from the Father alone. The Western bishops, however, were equally adamant that the Holy Ghost proceeds from the Father filioque - 'and the Son'. (shrink)