What religion was the Byzantine Empire?

Related questions

1. Who ruled the Byzantine Empire?
2. What did Suleiman do for the Ottoman Empire?
3. Why was Byzantium called the new Rome?
4. When did the Byzantine Empire start and end?
5. Why did Byzantine Empire fall?
6. How did Constantinople's name change over 1100 years later?
7. What led to the fall of the Roman Empire?
8. Why did Constantinople become Istanbul?
9. Why was 1453 a turning point in history?
10. Why did Rome split into two different empires?

Tags

1. #obscure
2. #council
3. #byzantium
4. #chose
5. #jewish
6. #official
7. #eponymous
8. #religion
9. #emperor
10. #constantine
11. #roman
12. #earlier
13. #years
14. #capital
15. #established
16. #constantinople
17. #nicaea
18. #christianity