Disasters with highest death tolls
893 Ardabil Earthquake
Abbasid Caliphate (now Iran)
Several earthquake catalogues and historical sources describe the 893 Ardabil earthquake as a destructive earthquake that struck the city of Ardabil, Iran, on 23 March 893. The magnitude is unknown, but the death toll was reported to be very large. The USGS, in their "List of Earthquakes with 50,000 or More Deaths", give an estimate that 150,000 were killed, which would make it the ninth deadliest earthquake in history.