[2] When the Normans besieged Bari in 1068–71, Argyritzos led the faction that favoured seeking terms.
Argyritzos appears to have inherited a leading position following its surrender on favourable terms to the Norman leader Robert Guiscard.
By 1075, the city's governors were one Lizius the viscount, probably a Norman, and Maurelianus the catepan, a local with the imperial rank of patrikios.
Robert re-captured Bari the following year and in April 1081 Argyritzos fled to the court of King Mihailo Vojislavljević of Duklja, a Byzantine vassal.
[1] An epitaph for a Kyri (Lord) Ioannatius in the church of Santa Maria de' Sannaci in Gioia del Colle, a suburb of Bari, has been identified as his.