Note 10 — Chapter VI · A CHURCH PILGRIMAGE
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Until the year 844 the Popes had continued to bear their own names after being elected to the Throne, but when the choice fell on a holy and humble man called Peter, he refused to keep the name of the Prince of the Apostles and chose for himself that of Sergivs—a renunciation which instituted the custom, followed ever since, of the Pope’s selecting a new name on his accession.