957 CE.
Shown on the map at 35.950°, 52.100°.
The 957 Caspian Sea earthquake took place in the Caspian Sea and its vicinity in 957 (Hijri year 346).
Text from the Wikipedia article 957 Caspian Sea earthquake, licensed CC BY-SA 4.0.
HistoryLayer draws the world as it was in any year from 123,000 BCE to 2026. Move the slider and the borders redraw for that year; the map carries 23,890 events, 12,790 people, 837 wars and 13,183 cities, each one readable in place. Signing in is optional and lets you keep what you find.