John the Baptist was the son of Zachary, a priest of the Temple in Jerusalem, and Elizabeth, a kinswoman of Mary who visited her. His date of birth is uncertain, but he was probably born at Ain-Karim southwest of Jerusalem after the Angel Gabriel had told Zachary that his wife would bear a child even though she was an old woman. He lived as a hermit in the desert of Judea until about A.D. 27. When he was thirty, he began to preach on the banks of the Jordan against the evils of the times and called men to penance and baptism "for the Kingdom of Heaven is close at hand".
He attracted large crowds, and when Christ came to him from Galilee, John recognized Him as the Messiah and baptized Him, saying,
It is I who need baptism from You
When Christ left to preach in Galilee, John continued preaching in the Jordan valley and formed a group of disciples. Fearful of his great power with the people, Herod Antipas, Tetrarch of Perea and Galilee, had him arrested and imprisoned at Machaerus Fortress on the Dead Sea when John denounced his adultrous and incestuous marriage with his niece Herodias, wife of his half brother Philip (son of the younger Mariamne). John was beheaded at the request of Salome, daughter of Herodias, who asked for his head at the instigation of her mother. According to the tradition, John the Baptist was buried at Sebaste in Samaria but his relics were brought all around the world during several centuries. Even at the Topkapi Palace in Istanbul, at the Holly Relics section today, there are some bones from the arm and from the skull which belongs to him and can be seen by the visitors.
John inspired many of his followers to follow Christ when he designated Him "the Lamb of God," among them Andrew and John, who came to know Christ through John's preaching. John is presented in the New Testament as the last of the Old Testament prophets and the precursor of the Messiah. His feast day of his birth is June 24th and the feast for his beheading is August 29th. He's clearly one of the most important saints of the Christian world.