Historical Events Siege of Constantinople Apr 6 Turkish forces under Sultan Mehmed II begin the siege of the Byzantine Empire capitol of Constantinople (now İstanbul), which falls May 29 Ottoman Sultan Mehmed the Conqueror Apr 21 Turkish fleet sinks ships Golden Receiver in Constantinople Events in 1453 1452 History by Year 1454 Famous People by Cause of Death Assassination Drug Overdose Gunshot Wound Murder Plane Crash Suicide