The Gesta Episcoporum Neapolitanorum records that "Gregorio filio eius" succeeded as "ducatum regente" on the death of "Sergio consule". Erchempert records that "Sergius magister militum" sent "duos liberos suos Gregorium magistrum militum et Cæsarium nec non et Landulfum generum suum Suessulanum" to fight "Lando…filium…Lando iunior" [Count of Capua] after his father´s death [dated to 859 by the editor of the MGH edition] but that "Cæsarium" was captured.
His father associated him in the government of Naples, and he succeeded his father in 865 as GREGORIUS III Duke of Naples. The Chronicon Ducum…Neapolis records that "Gregorius" succeeded Duke Sergius (without specifying the relationship between the two) "22 anno 12 ind" and ruled 5 years and 7 months.
The name of Duke Gregorius's wife is not known. 1
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