John II of Naples
Encyclopedia
John II was the duke of Naples from 915 to his death. He succeeded his father Gregory IV
Gregory IV of Naples
Gregory IV was the firstborn son of Duke Sergius II of Naples and successor of his paternal uncle, Bishop Athanasius, in 898, when he was elected dux, or magister militum, unanimously by the aristocracy. His other paternal uncle, Stephen, succeeded Athanasius as bishop...

 on the latter's death late in 915.

He had accompanied his father to the Battle of the Garigliano under Nicholas Picingli
Nicholas Picingli
Nicholas Picingli was the Byzantine strategos of Bari in the thema of Langobardia, who led the Byzantine contingent of the Christian League in the Battle of Garigliano in 915 during the Byzantine–Arab Wars....

, where the Christian coalition defeated the Moslems of the fortress on the Garigliano.
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