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OK, this quite a vague idea so I'm sure people will be able to point out flaws. But anyway.....
WI after first crusade KoJ isn't established as independant power but is rather subordinate to some (i.e. French or even papal) kingdom? Let's say there is no one who could really become king.
Or, stretching things some more second crusade works and as condition for help, or keeping force there, KoJ become french vasal. OK, the church structure remains as OTL due to special conditions.
If "KoJ" is a vasal how would this affect population and military? I'm thinking positive, since liege would be more willing to defend it and boost its strenth by additional settlers and troops as they would be ore invested in actually keeping it.
I'm not going to touch effects down the road since a lot depends on how things work out right away.
So, experts on crusades and that period, your thoughts?