479 BC Potidaea earthquake
478 BCE.
Shown on the map at 39.700°, 23.300°.
The 479 BC Potidaea tsunami is the oldest record of a paleotsunami in human history. The tsunami is believed to have been triggered by a Ms 7.0 earthquake in the north Aegean Sea. The associated tsunami may have saved the colony of Potidaea from an invasion by Persians from the Achaemenid Empire.
Text from the Wikipedia article 479 BC Potidaea earthquake, licensed CC BY-SA 4.0.