What cultural achievements were in Byzantium?

Events developed in such a way that Christianity and paganism began to fight in Byzantium, there was a transition from the ancient state to the medieval one. As a result, Christianity became the basis of culture. In Byzantium, temples began to be erected, which impressed Prince Vladimir. This prompted him to build the same in his country. Also, secular education was developing in the country, while in the schools of Western Europe, education was ecclesiastical.