In what way was the byzantine empire a departure from the roman empire ?

Orthodox Christianity is the main religion in Russia today. The Russian title “Czar” comes from the Roman and Byzantine term “Caesar.” The curved domes of Russian architecture were influenced by Byzantine designs. Russia's Cyrillic alphabet was created by the Orthodox missionaries from the Byzantine Empire.

i hope that helped, but im not just gonna give you a raw answer. you have to figure it out on ur own.

Agood day