See above. Instead of siding with the Pope, the Hungarians decide to look to Constantinople and enjoy an autocephalus patriarchy. Now Orthodox, how does this effect the Balkans and the areas around them? Do areas in what were once Yugoslavia more concretely become Orthodox? Would having a shared religion make the Hungarians and Byzantines more often allied? Might this spread Orthodoxy further into Central or Western Europe? Any other butterflies I might be missing?