New research into Thonis-Heracleion, a sunken port-city that served as the gateway to Egypt in the first millennium BC, was examined at a recent international conference at the University of Oxford. The port city, situated 6.5 kilometres off today’s coastline, was one of the biggest commercial hubs in the Mediterranean before the founding of Alexandria... This obligatory port of entry, known as ‘Thonis’ by the Egyptians and ‘Heracleion’ by the Greeks, was where seagoing ships are thought to have unloaded their cargoes to have them assessed by temple officials and taxes extracted before transferring them to Egyptian ships that went...