The siege of Thessalonica in 617 or 618 was an unsuccessful siege of the city of Thessalonica, the major Byzantine stronghold in the region, by the Avars and the Slavic tribes (Sclaveni) who had settled in the city's vicinity. The attack was the last and best-organized attempt by the Avars to take the city. It lasted 33 days and involved the use of siege engines, but in the end failed. The main source for these events are the Miracles of Saint Demetrius, named after Thessalonica's patron saint, Saint Demetrius.
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.