This althistory has multiple POD's, the principal being that the Great Schism never happened, this sparked a series of events. The most important event caused the Byzantine Empire to flourish since they weren't attacked by the crusader kingdoms, they even received help from kingdoms like France. The Powerful Byzantine Empire ended defying the Holy Roman Empire's claims, this sparked a war ended on a union between the Holy Roman Empire and the Byzantine Empire, forging the "true" Roman Empire, even though it was just a shadow of the former Empire by the year 1453.