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In page Pope Benedict XI:

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A note on the numbering: Pope Benedict X (1058–1059) is now considered an antipope by the Catholic Church. At the time of Benedict XI's election, however, Benedict X was still considered a legitimate pope, and thus the man the Catholic Church officially considers the tenth true Pope Benedict, Niccolo Boccasini, took the official number XI rather than X. This has advanced the numbering of all subsequent Popes Benedict by one digit. Popes Benedict XI-Benedict XVI are, from an official point of view, the 10th through 15th popes by that name.[citation needed]