What marked the end of the Byzantine Empire? The fall of the city of Rome to Odacer
The fall of Constantinople to the Ottoman Empire
The rise of the Russian Empire
The death of Justinian I

2

Explanation:

In 1453  the Ottomans surrounded Constantinople's ancient land wall for 55 days.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate