I always think the European border would have extended all the way to Iran (and thus more fairly represented in western cultures) if it hadn't fallen to the Arabian conquest.
[] Started with Charlemagne being crowned as Holy Roman Emperor when the Eastern Empress (Mother?) Irene still lives. Even to the point of friendly relationship between the Roman Emperor on Aachen and Arab Caliph on Baghdad, https://en.m.wikipedia.org/wiki/Abbasid–Carolingian_alliance
1. https://en.wikipedia.org/wiki/Battle_of_Salamis 2. https://en.wikipedia.org/wiki/Battle_of_Thermopylae