Revolt against Byzantine Emperor Heraclius (reign 610–641 CE). The Jewish revolt originated in Tiberius (Judea).
The Jewish revolt came to the aid of the Persian Sassanid invaders of the Byzantine Empire, Judea in particular. Jerusalem fell to the combined Persian–Jewish forces after a 20–day siege. The Persians gave the Jews authority to control the city, and they effectively controlled it for five years. However, at that point, Jerusalem swung back into Christian control c. 626 CE. Betrayals and massacres ensued, resulting in a huge Jewish exodus to Egypt.