I did the same. I started to gain the pope's favor right from the start and now my relations with the Papal States are perfect. I quickly advanced two of my generals to capture the rebel settlements to the east and southeast. After that, I arranged a marriage between my faction heir and their princess, only to later betray them by launching a full assault while two of my forces were already positioned at the Portugese castle bordering France and their capital, after a few turns the Portugese were eliminated from one simple assault.
I aimed to gain diplomatic relations with other powerful factions (one of them being France) and allowed my princess to engage in diplomatic affairs to increase her charm until it reached the maximum charm level.
I'm not finished yet and I also forgot to mention that I kicked the Moors out of Iberia. This is a lucky campaign for me, I've been getting a lot of upgrade opportunities one after another for a short period of time and population seems to be increasing rapidly.
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