I have started an AAR for CK2, after a week of not knowing who to play. I started as the Il-khanate as soon as they appeared, in early 1218. Before then, I played as nobody, so as not to meddle with the goings-on in those years.
They start off as Tengri pagan. I can't find anything that prohibits me from writing about pagans - I hope I haven't broken an unwritten rule.
This AAR is in a gameplay style, much like this one.