Josephus

Flavious Josephus (37A.D. – c. 100 A.D.) was of Jewish descent and fought with the Jews against the Romans during the First Jewish–Roman War which culminated in the Jews surrender in 67 A.D. Thereafter, Josephus fully defected to the Romans, was granted Roman citizenship and served as an advisor to the Romans who laid siege to Jerusalem in 70 A.D. resulting in the destruction of the city and the Second Temple. Thereafter, Josephus wrote The Jewish War (c. 75) and Antiquities of the Jews (c. 94). Both works provide important insight about the Jews, Jesus and Early Christianity.