John the Baptist was a Jewish preacher active in the early first century CE and a major figure in the New Testament. He called people to repentance, baptized followers in the Jordan region, and is closely connected with the beginning of Jesus’ public ministry.
Mark 1:4–11 and Matthew 3:1–17 describe John’s call to repentance and Jesus’ baptism; Luke 3:19–20 also places John’s imprisonment in the narrative.

John’s preaching and baptism
The Gospels describe John preaching repentance and baptizing people in water. His message included ethical demands and warnings of coming judgment. His baptism was connected with repentance rather than being identical to later Christian baptismal theology.
John and Jesus
All four canonical Gospels connect John with Jesus. The Synoptic Gospels describe John baptizing Jesus, while the Gospel of John emphasizes John as a witness who directs attention away from himself and toward Jesus.
Christian tradition interprets John as the forerunner who prepares the way for Christ. The Gospels apply prophetic language from Isaiah and Malachi to his ministry, although they arrange some details differently.
Conflict with Herod Antipas
John criticized the marriage of Herod Antipas to Herodias, who had been married to Herod’s brother. The Gospels say John was imprisoned and eventually executed by beheading. The Jewish historian Josephus also reports John’s execution by Herod Antipas, although his explanation emphasizes Herod’s fear of John’s influence over crowds.
John’s death
Mark and Matthew tell the story of a banquet at which Herodias’s daughter requests John’s head after Herod makes a public oath. The narrative has become one of the best-known episodes associated with John, though later art and tradition often add details beyond the biblical text.
Religious importance
John is honored as a saint in Catholic, Orthodox, Anglican, and other Christian traditions. He also appears in Islam as Yahya, a prophet associated with righteousness and the family of Zechariah. His historical ministry is important for understanding the religious environment in which Jesus’ movement emerged.