Antipas rejected his wife in 31 AD and married his niece Herodias, a granddaughter of Herod. John the Baptist
objected to this and criticised Antipas sharply.
The conflict is recounted directly in the Gospels and described in the Old Testament in the Bathsheba narrative, where God instructs the prophet Nathan (= John) to criticise King David (= Antipas).
Josephus describes the events without criticising Antipas’ morals. Texts on the Herodias scandal: 2 Sam. 11f; Mark 6:14-29 par.; Mark 7:24-30 par.; Ant. 18.5.1-2.