Bayezid I (Ottoman Turkish: بايزيد اول, Turkish: I. Bayezid), also known as Bayezid the Thunderbolt (Ottoman Turkish: یلدیرم بايزيد, Turkish: Yıldırım Bayezid; c. 1360 – 8 March 1403) was the Ottoman Sultan from 1389 to 1402. He adopted the title of Sultan-i Rûm, Rûm being an old Islamic name for the Roman Empire. He decisively defeated the Crusaders at Nicopolis (in modern Bulgaria) in 1396. Bayezid unsuccessfully besieged Constantinople and later was defeated and captured by Timur at the Battle of Ankara in 1402 and died in captivity in March 1403, triggering the Ottoman Interregnum.