Well I don't know much about coinage but ill try and help: This was in about 50-100 AD by the way: 1 pound 1 unit, about a labourers daily wage 5 pounds 4 sesterciis 100 pounds 100 sestercii or 25...
The Roman numeral system was based on the Etruscan numeral system with some modifications.Not much in history is known about the mysterious Etruscan people who once ruled the Romans centuries before...