According to the terms of the alliance, Musa was transferred to the European part over the Black Sea where he allied himself with Mircea of Wallachia.

The defeated Süleyman, while attempting to escape into Byzantine territories, was killed by villagers on 18 February 1411, and Musa found himself as the co-sultan of the empire.

In 1413, Mehmed gained the support of Serbian monarch Stefan Lazarević and the bey of the Turkish Dulkadirids, as well as some of the generals in Musa's army.

However, in 1416, Sheikh Bedreddin, one of Musa's former allies (chief military judge, the kazasker), led an unsuccessful revolt against Mehmed I.

[7] Other events that may be viewed as the continuation of the interregnum were the two rebellions of Mustafa Çelebi, another one of Bayazid's sons who had been hiding in Anatolia.

Mustafa was a fifth claimant to throne and he fought against both his brother Mehmed I in 1416 and his nephew Murad II in 1421 unsuccessfully.