Why in the IV-VI centuries in the Eastern Roman Empire there were many different heresies, but in the West this was not observed?

Outbreaks of heresy were common during the cultural heyday of medieval society. Byzantium experienced this “youthful” age in the 5th-6th centuries, and Western Europe – in the 12th-13th centuries.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.