- Giovanni Lotario de' Conti, 1161?–1216, Italian ecclesiastic: pope 1198–1216.
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- 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)