With the decline of Herodians, Judea, transformed into a Roman province, became the site of a violent struggle of Jews against Greco-Romans, culminating in the Jewish-Roman Wars, ending in wide-scale destruction, expulsions, and genocide. Jewish presence in the region significantly dwindled after the failure of the Bar Kokhba revolt against the Roman Empire in 132 CE. Nevertheless, there was a continuous small Jewish presence and Galilee became its religious center. The Mishnah and part of the Talmud, central Jewish texts, were composed during the 2nd to 4th centuries CE in Tiberias and Jerusalem. The region came to be populated predominantly by Greco-Romans on the coast and Samaritans in the hill-country. Christianity was gradually evolving over Roman paganism, when the area stood under Byzantine rule. Through the 5th and 6th centuries, the dramatic events of the repeated Samaritan revolts reshaped the land, with massive destruction to Byzantine Christian and Samaritan societies and a resulting decrease of the population. After the Persian conquest and the installation of a short-lived Jewish Commonwealth in 614 CE, the Byzantine Empire reconquered the country in 628.