John V (c. 1010 – c. 1040) was theconsul andduke of Gaeta from 1012 to 1032. He was the son ofJohn IV and Sichelgaita, sister ofSergius IV of Naples. He was either very young (an infant) when he succeeded his father or perhaps he was even born posthumously.
His regency was disputed byLeo, his father's brother, and thesenatrixEmilia, his father's mother. From 1014 to 1024, Leo acted as co-duke, but then he retired toItri and left the regency to Emilia (1025). In 1027, John gave refuge to Sergius IV, who had been forced out ofNaples. The two of them together plotted his retaking of Naples and recruitedRanulf Drengot, aNorman mercenary, to their cause.
Later, when Ranulf had realigned himself withPandulf IV of Capua, Sergius and John's old enemy and the old captor of Naples, John was threatened by the new Lombard-Norman alliance. In 1032, Pandulf conqueredGaeta and John went into hiding, where he continued to harass Pandulf and tried to control his territories without his capital. He died around 1040.
| Preceded by | Duke of Gaeta 1012 – 1032 | Succeeded by |
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