What are the reasons for the success of the Turkish sultans in the conquest of the Balkan Peninsula?

It is about the period from 1351 (the capture of the first fortress in the Balkans by the Turks) to the 1520s, when they occupied Belgrade. By this time, the Turkish sultans (Murad I, Bayazid I, Murad II, Mehmet II) seized Albania, the territory of modern Greece, Bulgaria, Serbia and Bosnia, as well as Byzantium, which by the beginning of the 15th century possessed only a small part of eastern France and turned into a vassal Wallachia.

Reasons for success:

Numerical superiority.
Features of the Ottoman army, it had strong artillery, which made it possible to take Constantinople in 1453 and they also created a devshirme system (a set of Christian Janissaries).
The disunity of opponents, for example, in the XIV century, internal conflicts were in Byzantium and she was at war with Bulgaria.



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