He is called the tetrarch, to distinguish him from the other Herod, in whose reign Christ was born, and who was king, but this Herod was tetrarch. Now his wife was the daughter of Aretas, king of Arabia, but he had sacrilegiously married his brother Philip’s wife, though she had offspring by his brother. For those only were allowed to do this whose brothers died without issue. For this the Baptist had censured Herod. First indeed he heard him attentively, for he knew that his words were weighty and full of consolation, but the desire of Herodias compelled him to despise the words of John, and he then thrust him into prison. And so it follows, And he added this above all, that he shut up John in prison.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: non occ.