Sergius I of Amalfi
Sergius I was the second Duke of Amalfi and first of the Musco Comite family.

In 958, Sergius, a citizen of the city of Amalfi
Amalfi is a town and comune in the province of Salerno, in the region of Campania, Italy, on the Gulf of Salerno, c. 35 km southeast of Naples. It lies at the mouth of a deep ravine, at the foot of Monte Cerreto , surrounded by dramatic cliffs and coastal scenery...

, assassinated the first duke, Mastalus II
Mastalus II of Amalfi
Mastalus II was the first duke of Amalfi from 957 until his death.He succeeded his father as patricius in 953, when he was still a minor. He came of age in 957 and was elected dux, raising him to equal rank with the Dukes of Gaeta and Naples. In the next year, he was assassinated by Sergius of...

 and usurped the throne. In order to establish a ducal dynasty as in Naples
Duchy of Naples
The Duchy of Naples began as a Byzantine province that was constituted in the seventh century, in the reduced coastal lands that the Lombards had not conquered during their invasion of Italy in the sixth century...

 and Gaeta
Duchy of Gaeta
The Duchy of Gaeta was an early medieval state centred on the coastal South Italian city of Gaeta. It began in the early ninth century as the local community began to grow autonomous as Byzantine power lagged in the Mediterranean and the peninsula thanks to Lombard and Saracen incursions.Our...

, he immediately associated his son Manso I
Manso I of Amalfi
Manso I was the duke of Amalfi and prince of Salerno . He was the son of Duke Sergius I and the greatest independent ruler of Amalfi, which he controlled for nearly half a century...

 with him in his office. When he died, Manso's succession was smooth.

Sergius had other sons named John, Adhemar, and Leo, as well as a son named Adelfer
Adelfer of Amalfi
Adelfer or Adelferio was briefly the usurper duke of Amalfi from 984 to 986, while his brother, Manso I, was reigning in Salerno.Manso returned to Amalfi in 986 and forced Adlefer to flee with his wife Drosa to Naples.-Sources:...

, who later also usurped rule in Amalfi.

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