> for example, a coalition of rulers around the turn of the second millennium – Pope Sylvester II, Holy Roman Emperor Otto III and Byzantine Emperor Constantine

> for example, a coalition of rulers around the turn of the second millennium – Pope Sylvester II, Holy Roman Emperor Otto III and Byzantine Emperor Constantine V, say – who conspired to fix the calendar Aside from the nations the author already mentioned we have the Korchak culture (sixth and seventh century) and later the Szeligi culture (situated in roughly present day Ukraine and Poland, respectively) and faking an archeological culture is fairly impossible even today. Yes there were quite a few others in the "early Slavs" era and area but I mention these two because of the amount of findings we have for them.