Is it possible? I am unable to find a method to do so. I was playing as the Italian Normans, and somehow ended up with a Orthodox hier, even though I kept my court in apulia. I suspect he became Orthodox because his tutor was.
It is very annoying because now the local bishops are starting to covert my realm to Orthodox.
It frankly is the only thing I can arrive at to explain it. The parents were both Norman Catholic.