I believe the OP is referring to Herod Antipas, son of Herod the Great, who was tetrarch of Galilee and Perea in the first century A.D., and who played a part in St. Luke's Passion.
My understanding of the situation is this:
Herod the Great was proclaimed "King of the Jєωs" by the Roman Senate in the late first century B.C., and ruled over a client state for the Roman Empire that roughly corresponds to David's and Solomon's Kingdom of Israel.
When Herod the Great died in the early first century A.D., his kingdom was divided into thirds, and each of his three sons was named tetrarch of a third. Herod Archelaus was given Judea, Samaria, and Idumea (which included Jerusalem); Herod Antipas was given Galilee and Perea; and Herod Philip II was given Batanea and the surrounding area.
After just a few years, in about 6 A.D., Herod Archelaus was dismissed by Rome, and Judea, Samaria, and Idumea came under direct Roman rule, in for the form of a Roman prefect/governor. One of these prefects was Pontius Pilate.
During the Passion of Our Lord according to St. Luke, Our Lord was initially brought before Pilate as prefect of Judea. Because Our Lord was a Galilean, Pilate sent Him to be tried by Herod Antipas, because he was tetrarch of Galilee. We all know the story from there.