Historians can learn about people from the past if they do not have written records. This is because in the prehistoric era there was no form of writing or records kept and historians still learnt about the period.
This was however possible through the use of remains and different types of artifacts found in the area which gave rise to the historians studying and inferring certain conclusions.
Explanation: when the fall of fall of the Byzantine Empire in 1453 was over, the Russian Orthodox Church evolved into a semi-independent branch of Eastern Christianity. In 1589 the metropolitan of Moscow received the title of patriarch.
