Orthodox Kingdom of Jerusalem

Basically, the idea is this: the ruler of the Kingdom of Jerusalem, surrounded by infidels from all sides and help from catholic Europe not coming, asks for the support of the much more closer Eastern Roman Emperor who demands conversion to Orthodox Christianity and restoration of the Patriarchate of Jersualem. ITTL, the ERE is slightly stronger and more stable, controlling all of anatolia and a little more mediterranean coast maybe.

How likely is this?
 
Very unlikely, I'd say. The nobility is still devoutly catholic, and the religious military orders are loyal directly to the pope and would not support an Orthodox king.
 
Not to mention any unlikelyhood of the Byzantine emperor demanding such a conversion - the Byzantines were quite willing to deal diplomatically with nonOrthodox people.

The patriarch being replaced by an Orthodox candiate is possible.

Though here's a question. What shape is the Kingdom of Jerusalem in relative to its neighbors here?

I mean, by sheer geography its surrounded by Muslims, but that can be in any level of unification - and in a world with a strong Byzantium probably isn't a high one.
 
The Byzantine diplomacy is such that outright conversion of the King and the nobility will not be a demand - but, if Jerusalem is found to be in a time of need or desperation, some demands will be made.

They will most likely be relative to the Patriarchy, as said above, one or more high-profile marriages between the high nobilities of the Empire and the Kingdom (as OTL) plus some trade deal. The status of Antioch will certainly be a matter, as the Emperor will most likely demand it to become a direct vassal of the Empire (which will probably be accepted).

The only way you can get a more Christian Orthodox KoJ is through immigration of traders, artisans and other professions from Constantinople to Jerusalem and Acre (and the reverse-Latins from the Levant, Arab Christians and maybe a few Muslims) going from the Crusader states to Constaninople and then come back -some of them having adopted Byzantine culture and maybe Orthodoxy. Then some of them or their descendants may become nobles, but none of them will become King, Prince or Count of one of the basic vassals of the King of Jerusalem.

Ofc, the above paragraph depends on having a strong Byzantine state which also protects (mainly through diplomacy) the Kingdom.
 
Not very likely, for the reasons that were already mentioned. Western attitudes were too rigid towards the Greeks.
 
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