According to the synoptic Gospels, Herod, who was tetrarch, or sub-king, of Galilee under the Roman Empire, had imprisoned John the Baptist because he reproved Herod for divorcing his wife and unlawfully taking Herodias, the wife of his brother Herod Philip I. On Herod's birthday, Herodias' daughter (whom Josephus identifies as Salome) danced before the king and his guests. Her dancing pleased Herod so much that in his drunkenness he promised to give her anything she desired, up to half of his kingdom. When Salome asked her mother what she should request, she was told to ask for the head of John the Baptist on a platter. Although Herod was appalled by the request, he reluctantly agreed and had John executed by beheading in the prison. Jewish historian Josephus also relates in his Antiquities of the Jews that Herod killed John, stating that he did so, "lest the great influence John had over the people might incline them to raise a rebellion, (for they seemed ready to do any thing he should advise), so Herod thought it best to put him to death." He further states that many of the Jews believed that the military disaster that fell upon Herod at the hands of Aretas, his father-in-law, was God's punishment for his unrighteous behavior.