Background
Mustafa was born in 1408 or 1409. He was the second son of Mehmet I. In the early years of the Ottoman Empire, all princes were required to work as provincial (sanjak) governors as a part of their training.
Mustafa was born in 1408 or 1409. He was the second son of Mehmet I. In the early years of the Ottoman Empire, all princes were required to work as provincial (sanjak) governors as a part of their training.
The epithet Küçük means "little" (or "young"). Young princes were accompanied by experienced statesmen. Mustafa"s sanjak was Hamideli (roughly modern Isparta in Turkey).
After defeating Mustafa, Murat laid a siege to Byzantine capital Constantinople (modern Istanbul) to punish the Byzantine Empire for supporting Mustafa.
Küçük Mustafa saw his chance to rebel. Supported with troops from Karaman, he began capturing the Anatolian territories of the Ottoman Empire.
The Byzantine emperor, seeing this rebellion as a chance for relief from the siege, also supported the rebellion. Although unsuccessful in the siege of Bursa, the co-capital of the empire, Küçük Mustafa captured İznik (Nicaea of antiquity), another important city in the Anatolia.
After hearing the news of the rebellion, Murat lifted the siege on Constantinople and returned to Anatolia.
He also corresponded with Şaraptar İlyas secretly. İlyas betrayed Küçük Mustafa and changed sides, and İznik was easily captured by Murat"s forces. Although Mustafa tried to escape, he was soon arrested and executed.