What happened 856 AD

856 Corinth earthquake occurred in November 856, in Byzantine Empire (now Greece), there were an estimated 45,000 deaths.

856 Tunisia earthquake occurred on December 3, 856, in Abbasid Caliphate (now Tunisia), there were an estimated 45,000 deaths.

The 856 Damghan earthquake or the 856 Qumis earthquake occurred on 22 December 856 (242 AH). The earthquake had an estimated magnitude of 7.9, and a maximum intensity of X (Extreme) on the Mercalli intensity scale. The earthquake's epicenter is estimated to be close to the city of Damghan, which was then the capital of the Persian province of Qumis. It caused approximately 200,000 deaths and is listed by the USGS as the sixth deadliest earthquake in recorded history.