Murad I of the Turks was killed at Sarajevo. Artbrooks mentioned the mixed forces on both sides.
The Ottoman Empire was in the ascendency and, although there were a couple of reverses, his successors built the Empire. Murad II married a Serbian princess and re-established dominance in Bulgaria. In 1453 te Ottomans take Constantinople, and after the traditional three days of looting, establish a city where many races lived in peace, including many Greeks and Jews. The Greek Orthodox Patriarch was not removed and continued to minister to his flock.

A most interesting part of the world, and in parts such as Kosovo, perhaps would have fared better if it had remained under Turk rule.