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Sergius IV (born, Luna, Tuscany [Italy]—died May 12, 1012, Rome) was the pope from 1009 to 1012. He became bishop of Albano, Papal States, about 1004. Elected to succeed Pope John XVIII, he was consecrated on July 31, 1009; he changed his name from Peter to Sergius out of deference to the first pope. He was powerless in the hands of the Roman nobles and the patrician Crescentius II, head of the Crescentii, an infamously...