Marriage in ancient Rome was a strictly monogamous institution: a Roman citizen by law could have only one spouse at a time. The practice of monogamy distinguished the Greeks and Romans from other ancient civilizations, in which elite males typically had multiple wives. Greco-Roman monogamy may have arisen from the egalitarianism of the democratic and republican political systems of the city-states. It is one aspect of ancient Roman culture that was embraced by early Christianity, which in turn perpetuated it as an ideal in later Western culture.