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Sergius III returned from exile to take over the papacy from the deposed antipope Christopher.
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Pope Sergius III
Head of the Catholic Church from 904 to 911
Pope Sergius III was the bishop of Rome and nominal ruler of the Papal States from 29 January 904 to his death. He was pope during a period of violence and disorder in central Italy, when warring aristocratic factions sought to use the material and military resources of the…Source: Wikipedia (CC BY-SA)
Antipope Christopher
Illegitimate ruler of the Catholic Church from 903 to 904
Christopher claimed the papacy from October 903 to January 904. Although he was listed as a legitimate pope in most modern lists of popes until the first half of the 20th century, the apparently uncanonical method by which he obtained the papacy led to his being removed from the…Source: Wikipedia (CC BY-SA)