Orhan I: The son of Osman I, he concentrated a lot of his time and power in conquering northwestern Anatolia from the Byzantium Empire. Some of the most important Military and Civil institutes were founded during his reign.
Bayezit I : He was the sultan that conquered Bulgaria and Northern Greece. Bayezit was also considered one of the most powerful rulers at the time. He led one of the first sieges on Constantinople by the Ottomans.