The Ottoman Empire (Ottoman Turkish: دَوْلَتِ عَلِيّهٔ عُثمَانِیّه Devlet-i Aliyye-i Osmâniyye, Modern Turkish: Osmanlı İmparatorluğu or Osmanlı Devleti) which is also known as the Turkish Empire or Turkey, was an empire founded in 1299 by Oghuz Turks under Osman I in northwestern Anatolia.
With conquests in the Balkans by Murad I between 1362 and 1389, the Ottoman sultanate was transformed into a transcontinental empire and claimant to the caliphate. The Ottomans overthrew the Byzantine Empire with the 1453 conquest of Constantinople (present-day Istanbul) by Mehmed the Conqueror.
During the 16th and 17th centuries, in particular at the height of its power under the reign of Suleiman the Magnificent, the Ottoman Empire was a powerful multinational, multilingual empire controlling much of Southeast Europe, Western Asia, the Caucasus, North Africa, and the Horn of Africa. At the beginning of the 17th century the empire contained 32 provinces and numerous vassal states. Some of these were later absorbed into the Ottoman Empire, while others were granted various types of autonomy during the course of centuries.
With Constantinople as its capital and control of lands around the Mediterranean basin, the Ottoman Empire was at the centre of interactions between the Eastern and Western worlds for six centuries. Following a long period of military setbacks against European powers, the Ottoman Empire gradually declined into the late nineteenth century. The empire allied with Germany in the early 20th century, with the imperial ambition of recovering its lost territories, but it collapsed and was dissolved by the Allied Powers in the aftermath of World War I. This resulted in the emergence of the new state of Turkey in the Ottoman Anatolian heartland, as well as the founding of modern Balkan and Middle Eastern states.