Because the Byzantine Empire was largely Greek in language and culture, what was the biggest influence of Byzantine/Greek culture on Russia?

The Byzantine Empire’s strongest cultural influence on Russia was its alphabet. Cyril and Methodius developed an early form of the Cyrillic script using Greek letters, and that script was adopted by Slavic peoples, including the Russians. So the best answer is “the alphabet,” not Greek language itself.

AI-written and checked against the verified answer.