Which nomadic group of people are responsible for the siege of constantinople leading to the end of the byzantine empire?

Ottoman Turks

Explanation:

The Ottoman Turks were responsible for the siege of Constantinople in 1453 that lead to the Fall of Constantinople and end of the Byzantine empire. The empire was constant in a war for almost many years, which came to be known as Crusades. The reason for the decline of the Byzantine empire was the result of weak rulers and military along with the political system.

its many islands, high mountains, and remote peninsulas isolated population centers.