Herodias was the mother of Salome.
She was also the grand-daughter of Herod, the Great. She first married her father's brother (her uncle), Philip I, and they had one child. Philip's half brother, Herod Antipas, wanted Herodias for his own wife, so he divorced his wife and married her while his brother was still alive. Because John the Baptist was so very verbal, criticizing their immorality, Herodias plotted to kill him. She had her daughter, Salome, gain Herod's favor by dancing seductively for him at a banquet. Herod was so pleased with her dancing that he promised her anything that she wanted....so at the request of her mother, she asked for the head of John the Baptist on a platter. Salome later married her Uncle Philip, then her cousin.