The Byzantine Emperor Manuel II Palaiologos supported Süleyman as claimant to the Ottoman throne.

From the evidence presented above, it can be understood that the relationship between the Byzantine Empire and the Ottomans increased dramatically contemporarily.

Despite defeating his brother and rival for the Ottoman throne, Musa, at the Battle of Kosmidion in June 1410, Süleyman's popularity waned.

[3] Süleyman was captured while attempting to escape and was given to Musa's bodyguard, Koyun Musasi, and strangled to death on 17 February 1411.

[5] Musa then retaliated against all who allied with Süleyman, including Manuel II, by briefly and fruitlessly laying siege to Constantinople in 1411.