currency book

This is kinda a side story of another main story I''''m working on. Tyrenor, Dimitri, Caedros and Fyrgath are 4 of the 9 ''''Sovereigns'''' in this fantasy world. They helped build the foundation of ''''Vires Imperium'''' (which is a country in my main story). They left the country to go on seperate paths 150 years ago, but they occasionally bump into each others and get into "minor disputes" which often results in a full-on war.