Which notable byzantine emperor attempted to re-create the old roman empire by conquering italy, north africa, and the balkans?

The notable Byzantine emperor that attempted to re-create the old Roman Empire by conquering Italy, North Africa, and the Balkans was Justinian.

Justinian was a Byzantine Emperor and he was the one responsible for the imperial government's administrative restructuring, as well as the one who sponsored the Codex Justinianus or law codification.