"Some of the radical Anabaptists undertook to introduce polygamy, appealing to the patriarchal order of society in justification of their position. Even among Luther's followers and associates there was no little uncertainty about the matter, as was not altogether surprising when the old order of things was undergoing revision at so many points, including the marriage of monks, priests, and near relatives. But Luther himself was unalterably opposed to any such revolution. Monogamy he considered, under ordinary circumstances, alone tolerable in a Christian community, and held that no Christian ruler has any moral right to legalize polygamy. At the same time, finding no explicit prohibition in the Bible, he believed exceptions might be allowed in certain extreme cases such as are now generally recognized in Protestant countries as justifying divorce."