14 And king Herod heard of him; (for his name was spread abroad:) and he said, That John the Baptist was risen from the dead, and therefore mighty works do shew forth themselves in him.
15 Others said, That it is Elias. And others said, That it is a prophet, or as one of the prophets.
16 But when Herod heard thereof, he said, It is John, whom I beheaded: he is risen from the dead.
17 For Herod himself had sent forth and laid hold upon John, and bound him in prison for Herodias' sake, his brother Philip's wife: for he had married her.
18 For John had said unto Herod, It is not lawful for thee to have thy brother's wife.
19 Therefore Herodias had a quarrel against him, and would have killed him; but she could not:
20 For Herod feared John, knowing that he was a just man and an holy, and observed him; and when he heard him, he did many things, and heard him gladly.
21 And when a convenient day was come, that Herod on his birthday made a supper to his lords, high captains, and chief estates of Galilee;
22 And when the daughter of the said Herodias came in, and danced, and pleased Herod and them that sat with him, the king said unto the damsel, Ask of me whatsoever thou wilt, and I will give it thee.
23 And he sware unto her, Whatsoever thou shalt ask of me, I will give it thee, unto the half of my kingdom.
24 And she went forth, and said unto her mother, What shall I ask? And she said, The head of John the Baptist.
25 And she came in straightway with haste unto the king, and asked, saying, I will that thou give me by and by in a charger the head of John the Baptist.
26 And the king was exceeding sorry; yet for his oath's sake, and for their sakes which sat with him, he would not reject her.
27 And immediately the king sent an executioner, and commanded his head to be brought: and he went and beheaded him in the prison,
28 And brought his head in a charger, and gave it to the damsel: and the damsel gave it to her mother.
29 And when his disciples heard of it, they came and took up his corpse, and laid it in a tomb.
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The figure of Herod the Tetrarch, mentioned in the Gospel, would not have appeared sympathetic either to historians or to his contemporaries. He was a petty, cruel, and suspicious tyrant with fairly pronounced sadistic tendencies, a typical representative of a degenerating dynasty. In spite of all this, he retained the formal status of a Roman ally, which he had inherited from his father. For this reason Rome, despite numerous complaints from local residents and reports from the procurators of Judea, could not fully deprive him of power, leaving him Galilee, for which the Roman authorities apparently felt less concern than for Judea.
All this did not prevent Herod from having his own peculiar notions of what he considered and called honor. He was boastful, but once he had sworn an oath in the presence of witnesses, he considered it humiliating not to keep it. Herodias took advantage of this. Judging by the Gospel account, she hated John far more than Herod himself did. Herod was content for John to be silent, or at least for his accusations not to be voiced publicly. Herodias wanted nothing less than to get rid of the prophet, to have him executed. She knew her husband well: the trick with her daughter's dance worked exactly as intended. Lust and boasting can be an utterly deadly combination, and Herod reluctantly does what he had not intended to do.
He was, however, if not religious, then at least superstitious. When he heard about Jesus, he decided that Heaven was punishing him for the murder of a man of God. Herod lived in constant fear and among many fears, so it is no wonder that he became superstitious to the point of absurdity. When a personality falls apart, even the most absurd and impossible things can appear completely real. So it was with Herod: he hated and feared John while John was alive, while at the same time involuntarily respecting him; and after executing the prophet, he began to fear his shadow.