Although both the Byzantines and the Armenians were Christian, the types of Christianity they professed had important differences that led to a lack of recognition and tensions between the two groups and a considerable part of their relationship, both internally and in foreign relations, was tied to religion. These tensions and the lack of compromise were an essential part to Byzantine-Armenian relations for centuries and resulted in a lasting separation between the Orthodox and Armenian Churches.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/1253/the-differences-between-byzantine--armenian-christ/.