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He was offered her hand but her mother Alice was tricked and then Constance was married off to Raymond of Poitiers.
What if Alice see through the Patriach's trick and marries off Constance to Manuel? Now, in this TL there's no guarantee that Manuel will become emperor but it's still possible and he'll be an important general for his brothers if they survive or hell he might still become emperor. But what does this mean for Greek influence in Antioch?