The fall of Constantinople, also known as the conquest of Constantinople, was the capture of the capital of the Byzantine Empire by the Ottoman Empire. The city was captured on 29 May 1453 as part of the culmination of a 53-day siege which had begun on 6 April.

The Serbian Despotate was a medieval Serbian state in the first half of the 15th century. Although the Battle of Kosovo in 1389 is mistakenly considered the end of medieval Serbia, the Despotate, a successor of the Serbian Empire and Moravian Serbia, lasted for another sixty years, experiencing a cultural, economic, and political renaissance, especially during the reign of Despot Stefan Lazarević. After the death of Despot Đurađ Branković in 1456, the Despotate continued to exist for another three years before it finally fell under Ottoman rule in 1459.