The Ottoman Empire became the center of the Islamic world following the retrenching of the Mongol Empire. Founded in Western Anatolia by Osman, the Ottoman Turks quickly conquered Constantinople in 1453 and expanded to become one of history's most important and lengthy empires.
CLIP FIVE: Venice & the Ottomans (from CRASH COURSE World History)
(The above Crash Course covers the Ottomans very well including: Osman, Janissaries, Devshirme, Suleiman, and Eunuchs; not to mention the roots of the Renaissance and Exploration in Europe)