The Byzantine Empire provoked Mustafa Celebi (Duzmece Mustafa) to dethrone Murad II. His main goal was to start a civil war and benefit from the confusion. Some of the Anatolian Turkish States supported Mustafa Celebi.

Mustafa Celebi defeated Sultan Murad’s army and declared himself as the sultan of Edirne. However, he was caught by the Ottoman Army in Ulubat and executed. Murad II established a new military force called Azeb in 1421, and marched through the Byzantine Empire who had the biggest role in the revolt of Mustafa Celebi and besieged Constantinople.

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