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Suppose that instead of a humiliating defeat and the capture of the Byzantine Emperor at Manzikert in 1074, there was a complete and total victory over the Seljuks, that the Byzantines managed to capture Alp Arslan and to up the ante slightly more, that the follow up campaigns for at least the next few years were successful in, at the very minimum, keeping out any other Turkic attempts at seizing Anatolia?

Would such a decisive victory, followed up well have been enough, perhaps to maintain the strength of the Empire in the long term? I'm interested in establishing an AH, where Byzantium not only survives, but flourishes into at least the early twentieth century, and perhaps, to the 'present day', and this seems like a good place to start.
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