Herodias (he-rô'di-as). Daughter of Aristobulus, one of the sons of Mariamne and Herod the Great, and consequently sister of Agrippa I. She first married Herod Philip I.; then she eloped from him to marry Herod Antipas, her step-uncle. The head of John the Baptist was granted at the request of Herodias. Matthew 14:8-11; Mark 6:24-28, a.d. 29.