The Ottoman Interregnum (also known as the Ottoman Triumvirate; Fetret Devri in Turkish) is a period when chaos reigns in the Ottoman Empire following the defeat of Sultan Bayezid I in 1402 by the Turco-Mongol warlord Tamerlane (Timur the Lame; Timur Bey in Turkish).The Interregnum lasts until 1413, when Mehmed Çelebi emerges as victor in the strife, crowns himself sultan, and restores the Empire.