Treasonous to whom, and why?
The Ottomans. I'll leave Abdul to fill in the rest.
Phillip said:It could very well be seen as moving away from Rome.
Not really. Let's let Mr Wikipedia help you answer your question.
http://en.wikipedia.org/wiki/Particular_Church
http://en.wikipedia.org/wiki/Eastern_Catholic_Churches
http://en.wikipedia.org/wiki/Byzantine_Rite