The Ottoman Empire existed between 1299 and 1923. It controlled the regions from Balkans to Arabia and from Black Sea to North Africa. It was founded as a small tribe and became a major power in 16th century. Its capital was Constantinople (now Istanbul).
The Ottomans originate from the Turkic tribes that escaped from Mongol invasion around 1250. It was formed as a chiefdom in modern-day Bilecik. The Ottomans quickly captured vast territories around Balkans and Anatolia and they conquered Constantinople in 1453.