LogFAQs > #912980875

Ambitious and (to a lesser extent) Envious and Proud are bad traits for vassals. Content and Humble make them significantly less troublesome. If you want to, you can try and game it a bit by offering to educate your vassal's heir(s).

I'm personally fooling around trying to reform a faith. Germanic seems to reform ~90% of the time in the 769 and 867 starts, so I figured I would try my hand with Romuva. I already have 3 holy sites, but moral authority is exactly that high(once you get big, you're basically the only Romuva ruler), so I'm going for a fourth and then scrounging up the last 10 authority. Definitely doing Temporal Power, and not even just power-gaming: I'm the only independent Romuva realm, so it doesn't make sense for their to be another power-base.

Also, good luck if you want to reform Suomenusko or Slavic. The holy sites are scattered everywhere, and the former is on the chopping block from the Germanic blobs. The latter is super-vulnerable to early conversions and getting overrun by hordes.
Still better than Tengri though.