I´ve noticed I got his little rewards (by the time I received them they were little, considering my half-a-million+ treasury) pretty frequently when I fought against excommed factions, even more so than when I fought Muslims or other infidels. Building churches, or religious buildings in general, also seems to help, but the exact trigger for the gifts are a mystery - as is most of what the Pope does. He´s just plain weird most of his time.
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