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In·no·cent III(ĭn′ə-sənt) Originally Lotario di Segni. 1161-1216.
Pope (1198-1216) whose reign was marked by the Fourth Crusade and papal intervention in European politics.
(Biography) original name Giovanni Lotario de' Conti. ?1161–1216, pope (1198–1216), under whom the temporal power of the papacy reached its height. He instituted the Fourth Crusade (1202) and a crusade against the Albigenses (1208), and called the fourth Lateran Council (1215)