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Very implausible idea that won't leave my head. Suppose the Roman Britons managed to hold on in the British Isles, maybe even expanding by marriage alliances into Scotland and Ireland and repelling the Saxon waves (some version of King Arthur or whatever).

They manage to hold off any threats on their own through the 6th and 7th centuries, before reaching out to the Eastern Roman Empire before the Arab Conquests and appeal to be integrated (albeit as an Excharate or something along those lines due to distance and a new native governance). How would the presence of a heavily Latin-speaking, Celtic Christian contingent of "Romans" effect the largely Greco-Slavic Iconoclast-Orthodox Eastern Empire? How much do you think the Briton Romans would involve themselves in Constantinople's affairs or vice versa? Would having a possibly hereditary sub-kingdom effect Byzantine succession laws? What contributions could a Byzantine Britain contribute to the prosperity of the Byzantine Empire?
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