Finished first muslim game. Started in 867 as Emir of Berbera, took over Ethiopia(Abyssinia), then blobbed from there. Once I achieved Empire status I got bored, so I switched from sunni to ibadi and eventually ousted the Arabian empire from the middle east. I was actually about to exterminate the sunni heretics(Ibadi is orthodox Islam now) when they successfully invaded Cumania, taking it from a Catholic Tartaria(which was founded by a Suomenusko Pecheneg of all things. I had nothing to do with that.) Basil himself turned to Iconoclasm and converted the ERE, wiping out orthodoxy. Then a Catholic inherited, converted most of the empire and died, leaving the throne to an Iconoclast Emperor, who then reconverted the empire. Then, that sequence happened again.
I saw a slavic Ruthenia blobbing into pretty much all of their holy sites, so I switched to the slavic ruler of Moldau and swore fealty so they could reform. They ended up ruling Rus, Ruthenia, Lithuania, and Finland, although never under the same ruler. The kingdom titles flip flopped between two dynasties the whole time, the Dregovichs and the Dobrynichs. I sent a gold donation to the Pratihara when they got large enough to form Rajastan, after which they slowly took over all of the Bengal Empire(Deccan Empire formed on its own). With no interference from me, Mauritania turned Jewish, and conquered Mali and southern Andalusia. That is, until a random ibadi adventurer invaded and toppled their rule.
The hordes were pretty boring this game. Aztecs wasted their invasions on tiny bits of land in Spain, and turned Portuguese and catholic. The Mongols ended up fighting each other after just 10 years, wiping out their doomstacks. Turkistan is Mazdaki, which is the new Manichean orthodox, which was the new Zoroastrian orthodox. And yes, Hungary, now Carpathia can into France(succession, but not before Breton culture into France, almost wiping out Frankish). Speaking of Hungary, a (catholic)Makedon ended up forming Hungary, not the Magyars, which lost to Bulgaria. They remained on the throne of Hungary long after they lost the ERE. Somehow the Papacy got land in Lotharingia. Four years before the game ended I jihaded for Italy, gave it to a Samaritan, and gave him independence, because why not. Surprisingly no one attacked him.