Herod Antipas
According to the New Testament, John was sentenced to death and subsequently beheaded by Herod Antipas sometime around AD 30 after John rebuked him for divorcing his wife Phasaelis and then unlawfully wedding Herodias, the wife of his brother Herod Philip I. Josephus also mentions John the Baptist in the "Antiquities of the Jews" and states that he was executed by order of Herod Antipas in the fortress of Machaerus.