Battle of Nicopolis in the context of "Froissart of Louis of Gruuthuse (BnF Fr 2643-6)"

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 sultan of the Ottoman Empire from 1389 to 1402. He adopted the title of Sultan-i Rûm, Rûm being the Arabic name for the Eastern Roman Empire. In 1394, Bayezid unsuccessfully besieged Constantinople. Bayezid vanquished all the Beyliks and proceeded to conquer and vassalize the entirety of Anatolia. In 1402, he once more besieged Constantinople, appearing to find success, but he ultimately withdrew due to the invasion of the Turco-Mongol conqueror Timur. He defeated the crusaders at the Battle of Nicopolis in what is now Bulgaria in 1396. He was later defeated and captured by Timur at the Battle of Ankara in 1402 and died in captivity in March 1403, which triggered the Ottoman Interregnum.

The Sanjak of Vidin or the Vidin Sanjak (Bulgarian: Видински санджак, Serbian: Видински санџак, Turkish: Vidin Sancağı) was a sanjak in the Ottoman Empire, with Vidin as its administrative centre. It was established after the Battle of Nicopolis in 1396 out of the territories of the Tsardom of Vidin and in the mid-15th century annexed some territories that belonged to the Serbian Despotate before the Ottomans captured it.