- May 2014
Kingdom of Poland and Grand Duchy of Lithuania had common border. Century or so before de jure establishment of the Commonwealth these two states had been unified through personal union aka marriage between the rulers of these two medieval states. Where is the common border between the Eastern Roman Empire aka Byzantium and Russia? During the time of Sviatoslav of Kiev they had one, but this had been before christianization of Rus and long before the establishment of Moscow grand duchy, tzardom and empire. How you gonna unite two entities that are situated on different parts of the continent with enormous distance between them, two states that had nothing in common but a religion?