Melzi was a "civitas" (town) of the Roman Empire during late antiquity. It was also known as Meditanus.
The town was in the Medjerda River valley of northern Tunisia. It was a civitas of the Roman province of Africa Proconsularis,
And the town has been tentatively identified with ruins at the Oued-Melzi Wadi and the Bagrada river confluence.
In antiquity the town was also the seat of a Christian bishopric, suffragan of the Archdiocese of Carthage. 
There are two documented bishops of this African dioceses. 
The town was mentioned by Augustine and Optatus
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