The 365 AD Crete earthquake was an undersea earthquake that occurred at about sunrise on 21 July 365 AD in the Eastern Mediterranean, with an assumed epicentre near Crete. Geologists today estimate the quake to have been 8 on the Richter Scale or higher, causing widespread destruction in central and southern Greece, northern Libya, Egypt, Cyprus, and Sicily. In Crete, nearly all towns were destroyed.
The Crete earthquake was followed by a tsunami which devastated the eastern coasts of the Mediterranean, particularly Alexandria and the Nile Delta, killing thousands and hurling ships nearly two miles inland. The quake left a deep impression on the late antique mind, and numerous writers of the time referred in their works to the event.