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Disclaimer. This idea did come about after playing in a Europa Universalis IV mod which played with the idea of a byzantine+Sasanid team up against the Muslim invaders in the 7th century. This case would surly butterfly the destruction of the Eastern Romans at the Hand of the Ottoman Turks.
Anyway I just wanted to know you folks opinions of this?
1) Is it Plausible, could the two nations put aside their hatred and push back a mutual enemy? Or did they both not think it was a big enough threat.
2)What would the possible aftermath of such a win for the old empire.