Battle of Kosmidion
The Battle of Kosmidion, fought on 15 June 1410, occurred during the Ottoman Interregnum and was fought between the forces of the brothers and princes Musa Çelebi and Süleyman Çelebi, at Kosmidion just outside the land walls of Constantinople. During the battle, some of Musa's vassals, including Vuk Lazarević, deserted him and joined Süleyman. The battle ended in a victory for Süleyman Çelebi.
