I got a 10% glory bonus in my Egyptian campaign without joining or calling a Jihad {I ignored the only one called thus far - I moded the game to 6 months per turn and it's something like 1112 - as it was against a Buzantine city and I didn't want to lose trade for an isolated city} , without any big war {the Turks tried once but made it obvious there hearts weren't in it and it ended almost as soon as it began} and thus by only taking rebel settlements .
I think certain cities contribute to the bonus {Constantinople might be one ?} and Jerusalem is certainly one city that was {and is} very important to all three major faiths in the game .
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