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Happiness buildings are the following:

Town Watch (+10)
Town Guard (+10)
Town Militia (+10)
County Militia (+10)
Brothel (+10/level)
College of Surgeons (+40)
Church (+20)
Mosque (+20)
Monestery (+10)
Reliquary (+30)
Cathedral (+40)
Grand Mosque (+40)
Watch Towers (+10)
Border Fort (+10)

Must haves are the Watchtower, Border Fort and the Town Watch immediately. In addition to priests, keep at least one spy in each province. It will boost up the loyalty.

Still, there might be some randomness and you may not be able to avoid the end of the world incident. I personally have never experienced it but I assume I'm in the minority.

Hth


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