For Herod himself had sent forth
Some of his guard, a detachment of soldiers,
and laid hold upon John;
who seized upon him, and took him up:
and bound him in prison;
in the castle of Machaerus:
for Herodias' sake, his brother Philip's wife, for he had married
whilst his brother was living, and who had had children by her; (See Gill on Matthew 14:3).