After that the Serbian throne was offered to Stephen Tomašević, the future king of Bosnia, which infuriated Sultan Mehmed. Sultan Mehmed II decided to conquer Serbia completely and arrived at Smederevo; the new ruler did not even try to defend the city. After negotiations, Bosnians were allowed to leave the city and Serbia was officially conquered by Turks on June 20, 1459 ending the existence of the Serbian Despotate.