Matthew 14:3

“For Herod had laid hold on John, etc.] By his servants, whom he sent to apprehend him: and bound him; laid him in chains, as if he was a malefactor; and put him in prison, in the castle of Machaerus f825, for Herodias’s sake; who was angry with him, had a bitter quarrel against him, and by whose instigation all this was done; who was his brother Philip’s wife. This Herodias was the daughter of Aristobulus, son to Herod the Great f826, and brother to Philip, and to this Herod; so that she was niece to them both; and first married the one, and then the other, whilst the former was living. Philip and this Herod were both sons of Herod the Great, but not by the same woman; Philip was born of…”

“For Herod had laid hold on John ... - See Mark 6:17-20; Luke 3:19-20. This Herodias was a granddaughter of Herod the Great. She was first married to Herod Philip, by whom she had a daughter, Salome, probably the one that danced and pleased Herod. Josephus says that this marriage of Herod Antipas with Herodias took place while he was on a journey to Rome. He stopped at his brother’s; fell in love with his wife; agreed to put away his own wife, the daughter of Aretas, King of Petraea; and Herodias agreed to leave her own husband and live with him. They were living, therefore, in adultery; and John, in faithfulness, though at the risk of his life, had reproved them for their crimes. Herod was…”

“His brother Philip's wife - Who was still alive. Mar 6:17. Matthew 14:4”

“14:3-12 The popular appeal of John’s message posed a political threat (see Josephus, Antiquities 18.5.2). Years after John’s execution, the Jews viewed Herod’s military defeat at the hands of Aretas (AD 36) as a just recompense for putting an innocent man to death.”

“Herod: Mat 4:12; Mar 6:17; Luk 3:19, Luk 3:20; Joh 3:23, Joh 3:24 Herodias': This infamous woman was the daughter of Aristobulus and Bernice, and granddaughter of Herod the Great. his: Luk 13:1 Philip's: Herod Philip, son of Herod the Great and Mariamne. Matthew 14:4”