Tetrarch. This word, derived from the Greek, signifies one that rules over the fourth part of a kingdom: as Herod then ruled over Galilee, which was but the fourth part of the kingdom of his father. (Challoner)

St. John had been now imprisoned in the castle of MachÃ¦rus about a year, at the instigation of Herodias. It is very probable that before this he would have fallen a sacrifice to her vindictive temper, had it not been for the great personal respect in which (on account of the singular holiness of his life) he was held, not only by the people, but by Herod himself.

Josephus, in his Antiquities of the Jews, gives the following account: This Herod, who was also called Antipas, was the son of Herod the great, by his sixth wife, Cleopatra, of Jerusalem. A general opinion obtained among the Jews, that Herod’s discomfiture by the Parthians, was the effect of divine vengeance upon himself and his army, for the blood of John, surnamed the Baptist. He was a man of immaculate character, whose object was to exhort the Jews to the practice of virtue and piety, point out the necessity of repentance, and hold forth by baptism the import of regeneration to a new life, which he made to consist, not in abstaining from a particular sin, but in an habitual purity of both mind and body. Such was the influence of this great and good man, as appeared from the multitude of his disciples, and the veneration of his life and doctrines, that Herod was apprehensive of a revolt. He therefore sent him bound to prison, where by the malice of Herodias, his brother’s wife, he was afterwards put to death, which inhuman act was shortly followed by the marked vengeance of heaven on its execrable author, as the Jews were firmly convinced. (Book xviii, chap. vii.)

For Herod going to Rome, at the instigation of Herodias, expecting to be made king, was severely reproved by the emperor Caius, (Caligula) who transferred his tetrarchy to Agrippa, in consequence of which, Herod retired with his wife to Spain, and died in exile. (Wars of the Jews. Book ii, chap. viii.) In the 18th book, and 9th chapter, Josephus says, the place of his exile was Lyons, in Gaul; that his goods were also confiscated, and that both himself and Herodias died in great misery.