The Ottoman Empire (; Ottoman Turkish: دولت عليه عثمانیه Devlet-i ʿAlīye-i ʿOsmānīye, literally "The Exalted Ottoman State"; Modern Turkish: Osmanlı İmparatorluğu or Osmanlı Devleti; French: Empire ottoman), known to the Ottomans as the Empire of Rûm/Rome (Ottoman Turkish: دولت علنإه روم, 'Exalted State of Rome'), and known in Western Europe as the Turkish Empire or simply Turkey, was a state and caliphate that controlled much of Southeast Europe, Western Asia and North Africa between the 14th and early 20th centuries. It was founded at the end of the 13th century in northwestern Anatolia in the town of Söğüt (modern-day Bilecik Province) by the Oghuz Turkish tribal leader Osman I. Although initially the dynasty was of Turkic origin, it was Persianised in terms of language, culture, literature and habits. After 1354, the Ottomans crossed into Europe, and with the conquest of the Balkans, the Ottoman beylik was transformed into a transcontinental empire. The Ottomans ended the Byzantine Empire with the 1453 conquest of Constantinople by Mehmed the Conqueror.