Philip, the brother of Herod (?) was the tetrarch of Iturea:

Luke 3:1New King James Version (NKJV)

He was a Roman, the governor of Judea.

Luk 3:1 Now in the fifteenth year of the reign of Tiberius Caesar, Pontius Pilate being governor of Judaea, and Herod being tetrarch of Galilee, and his brother Philip tetrarch of Ituraea and of the region of Trachonitis, and Lysanias the tetrarch of Abilene,

After Herod's death, his kingdom was divided among three of his sons.

• Herod Archelaus became king of Judaea
• Herod Antipas became Tetrarch of Galilee
• Herod Philip II became tetrarch of territories east of the Jordan