Sergius VII, Duke of Naples

Sergius VII was the thirty-ninth and last duke of Naples. He succeeded his father John VI on the Neapolitan throne in 1122 at a time when Roger II of Sicily was rising rapidly in power. When Roger succeeded as duke of Apulia in 1127 and was crowned king in 1130, the fate of Naples hinged on Sergius' relations with the Sicilian court.

The dukes of Naples were the military commanders of the ducatus Neapolitanus, a Byzantine outpost in Italy, one of the few remaining after the conquest of the Lombards. In 661, Emperor Constans II, highly interested in south Italian affairs, appointed a Neapolitan named Basil dux or magister militum. Thereafter a line of dukes, often largely independent and dynastic from the mid-ninth century, ruled until the coming of the Normans, a new menace they could not weather. The thirty-ninth and last duke, Sergius VII, surrendered his city to King Roger II of Sicily in 1137.