Wi: Roger of Sicily becomes King of Jerusalem?

What would motivate either Roger or the Byzantines ally with one another, given their past conflicts? The de Hauteville's of Italy had usually been adversaries of the Komnenos dynasty since Roger Guiscard.
This, as Roger would be the ruler of both Jerusalem and Palermo :):

So, this TL would see Roger seeking the aid of Manuel I Comnenus (a crusade against Egypt), which could potentially affect the German involvement, under Conrad III, in the alternate Second Crusade (1145-49). The reason being that the Holy Roman Empire had interests in Italy, specifically about whom should be on the Papal throne. And the Papal States had to play both the Germans and the Normans against each other to preserve its autonomy.

And Manuel had a dream of re-union of the churches, a dream that he almost achieved with Pope Hadrian IV, but the Sicilians striked back and repelled the Romans off the Italian Peninsula. With Sicily-Jerusalem allying with Constantinople and a favourable Patriarch [of Constantinople], this might happen, since Manuel was a sort of 'conquering hero' for the people, claimed to be the ''most blessed of the Emperors''.
 
Easiest PoD is probably to have Baldwin's Armenian wife die before the marriage (or proposal) to Adelaide... that way the marriage is always legal and there's no way to get it annulled on the grounds of bigamy.

I would think then, with the Crown of Jerusalem, he's less intransigent against the Greeks and more willing to turn over Antioch for strategic assistance against the Turks. How about this... The Emperor John comes down on campaign, and in joint action with Jerusalem, they take Aleppo (and/or Shaizar). Antioch is nominally restored to the Empire under a Norman (or perhaps an Anglo-Saxon or Frank, but definitely a westerner under oath to the Emperor that is also palpable to Roger) while the new conquests are firmly under Roger as nominal suzerain.

His hold on the Levant still needs to be somewhat precarious... so that as Roger's reign carries on, he's less likely to turn against the Byzantines. Perhaps he takes a defeat trying to encroach alone (with his vassals, of course) upon Damascus. This makes the Greek offer of joint action in the next campaign against Egypt more strategically viable... any remaining animosity against the Greeks lets him make concessions to the Copts. Throw in a marriage alliance of him or his heir to a Greek of Imperial lineage, coupled with a continued amity and cooperation in the interests of Christendom, and that might slowly sate the Hauteville's animosity...

I'm thinking the best solution is for not only Baldwin's and Adelaide's marriage to continue, but that they produce an heir against all the odds and that Roger is actually a Regent. That way if he gets distracted by Sicily (or North Africa, IIRC) he can end up going to that while Jerusalem still has a continued source for Norman assistance. When the heir attains his majority, the Court of Jerusalem elects him to be their king and thanks Roger for his service.
 
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