John the Baptist
John was God's forerunner for Jesus telling people to get ready for their Messiah.
John the Baptist was Jesus' cousin.
When John heard the voice of Mary the mother of Jesus he jumped in his mother Elizabeth's womb.
Herod the Tetrarch was Herod Antipas ruler of Galilee and Perea 4BC-AD39 and he had John beheaded to keep a promise to the daughter of Herodias.
John the Baptist Beheaded
14At that time Herod the Tetrarch heard the reports about Jesus, 2 and he said to his attendants, "This is John the Baptist; he has risen from the dead! That is why miraculous powers are at work in him."
3 Now Herod had arrested John and bound him and put him in prison because of Herodias, his brother Philip's wife, 4for John had been saying to him: "It is not lawful for you to have her." 5Herod wanted to kill John, but he was afraid of the people, because they considered him a prophet.
6 On Herod's birthday the daughter of Herodias danced for them and pleased Herod so much 7 that he promised with an oath to give her whatever she asked. 8 Prompted by her mother, she said, "Give me here on a platter the head of John the Baptist." 9 The king was distressed, but because of his oaths and his dinner guests, he ordered that her request be granted 10and had John beheaded in the prison. 11 His head was brought in on a platter and given to the girl, who carried it to her mother. 12John's disciples came and took his body and buried it. Then they went and told Jesus.
see also: Mark 6:14-29, Luke 9:7-9