From resignations to drownings and beheadings, the papacy is full of unusual and surprising moments.
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Pope Sergius III (January 904-April 911) -- He is believed to be the only pope who ordered the murder of another pope with the strangulation death of Antipope Christopher. He's also rumored to have fathered a son with the daughter of a count who helped the pope expand into more territory. His son went on to become pope himself.