Mihaloğlu Mehmed Bey

According to the Ottomanist Franz Babinger, Mihaloğlu Mehmed was a son of Köse Mihal, a contemporary and companion of the founder of the Ottoman beylik, Osman I.

[3] As a reward, Musa appointed Mihaloğlu as beylerbey (commander in chief and governor-general) for Rumelia, possibly as a counterweight to two other powerful uc beğs, Evrenos and Pasha Yiğit Bey, who had been major figures in Süleyman's regime.

He commanded Mehmed's vanguard in the first clash outside Bizye, and both there and later at a battle near the Maritsa River he played a major role in the defeat of Musa's forces.

Aided by Junayd of Aydın, Mustafa had managed to win over the uc beğs of Rumelia, such as Turahan Bey, the sons of Evrenos, and the Kümelioğlu family, and had seized Edirne and the European provinces of the empire.

[9] On the advice of his councillors—three members of the Timurtaş family, Hacı Ivaz Pasha, and Çandarlı Ibrahim Pasha—Murad released Mihaloğlu from his prison and to assist in the campaign against Mustafa,[10] and hopefully draw the Rumelian beys to murad's side.

According to Aşıkpaşazade, Mehmed called across the water to the various Rumelian beys in Mustafa's army, accusing them of treachery, while others met with Junayd to convince him to desert with promises of restoring him to his former domains.

The eyewitness John Kananos describes how the vanguard under Mihaloğlu ravaged the city's suburbs, before Murad himself arrived on 20 June and the siege began in earnest.

Mustafa did not resist long, fleeing to Constantinople on 30 September, whence he seized İznik, which he continued to rule until defeated and killed by Murad's forces in January 1423.