At that time Herod the tetrarch heard of the fame of Jesus,
The time of this alarm of Herod Antipas appears to have been during the mission of the Twelve, and shortly after the Baptist-who had lain in prison for probably more than a year-had been cruelly put to death.
At that time Herod the tetrarch - Herod Antipas, one of the three sons of Herod the Great, and own brother of Archelaus (Matthew 2:22), who ruled as Ethnarch over Galilee and Perea.
Heard of the fame of Jesus - "for His name was spread abroad" (Mark 6:14).