Flavius Josephus (37 AD–100 AD) was a first-century Jewish historian and military leader, born only a few years after the crucifixion of Jesus Christ. He wrote the Jewish War, which describes in some detail the Roman conquest of Palestine in the First Jewish-Roman War (66 AD–73 AD).
Josephus is credited with two major works: The Jewish Wars and Antiquities of the Jews. It’s of interest to Christians that Josephus mentions Jesus Christ twice and John the Baptist once in Antiquities of the Jews. The first mention of Jesus is disputed by scholars as a later Christian interpolation. The second mention and the reference to John the Baptist are considered authentic.
First: “Jesus was the Messiah and a wise teacher who was crucified by Pontius Pilate.”; Second: “The brother of Jesus, who was called Christ, whose name was James”; John the Baptist: “The imprisonment and death of John the Baptist by order of Herod Antipas, the ruler of Galilee and Perea.”