The Christian armies united the pope with several South Italian princes of Lombard or Greek extraction, including Guaimar II of Salerno, John I of Gaeta and his son Docibilis, Gregory IV of Naples and his son John, and Landulf I of Benevento and Capua.
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At the Battle of Garigliano he single-handedly defended the bridge of the Garigliano against 200 Spaniards, an exploit that brought him such renown that Pope Julius II tried unsuccessfully to entice him into his service.