A Jewish diaspora existed for several centuries before the fall of the Second Temple, and their dwelling in other countries for the most part was not a result of compulsory dislocation. Before the middle of the first century CE, in addition to Judea, Syria and Babylonia, large Jewish communities existed in the Roman provinces of Syria Palaestina, Egypt, Crete and Cyrenaica, and in Rome itself; after the Siege of Jerusalem in 63 BCE, when the Hasmonean kingdom became a protectorate of Rome, emigration intensified. In 6 CE the region was organized as the Roman province of Judea. The Judean population revolted against the Roman Empire in 66 CE in the First Jewish–Roman War which culminated in the destruction of Jerusalem in 70 CE. During the siege, the Romans destroyed the Second Temple and most of Jerusalem. This watershed moment, the elimination of the symbolic centre of Judaism and Jewish identity motivated many Jews to formulate a new self-definition and adjust their existence to the prospect of an indefinite period of displacement.