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Callixtus II
Pope Callixtus II (c. 1065 – 13 December 1124), born Guy of Burgundy, was Pope from 1119 to his death.
During his papacy, Callixtus created a small channel through the sealed Porta Metronia for the Acqua Mariana, a river whose stagnant waters would later cause an outbreak in 1601.