Sergio became duke in 840 through the collective choice of the local aristocracy, although not through a formal election. A "duke" was no longer purely a military official within the Byzantine hierarchy, but a regional leader with his own interests. (Granier).
Events
Date of Birth: unknown.
Place of Birth: unknown.
Granier states that the date is unknown, but during the first decades of the 9th century.
Date of Death: June or July 864.
Place of Death: unknown.
The date is given by Schipa (1892, p. 643). Granier gives before the end of August 864.
Relationships
Father: Marinus.
This relationship is given by Skinner (p. 48), by Schipa (1892, p. 610), and by Granier.
Mother: Eupraxia.
This relationship is given by Skinner (p. 48), by Schipa (1892, p. 610), and by Granier. Marinus and Eupraxia were nobiles. Granier mentions a hypothesis that Eupraxia's mother was a daughter of an earlier duke of Naples, Stefano II, based on the names Gregorio, Cesarius, and Stefano being given to Sergio's sons.
Spouse: Drusa.
This relationship is given by Vetere and by Granier.
Children:
(Complete source citations for facts about the children on this page are currently outside of the scope of this project. Most information below is from Schipa and from Granier.)
Athanasius (probably born at the beginning of October 831 - died 872), bishop of Naples.
Gregorio III (died 870), duke of Naples.
Cesarius.
Stefano (died 907), bishop of Sorrento and then of Naples.
a daughter married Landolfo di Capua.
References
Granier, Thomas "SERGIO I, duca di Napoli" in Dizionario Biografico degli Italiani Volume 92 (2018).
Schipa, Michelangelo. "Il ducato di Napoli" in Archivio Storico per le Province Napotelane (1892-4).
Skinner, Rachel. Family Power in Southern Italy. (Cambridge U.P., 1995).
Vetere, Carla. “GREGORIO” in Dizionario Biografico degli Italiani Volume 59 (2002).