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, Fifteenth year - This was the fifteenth of his principality and thirteenth of his monarchy: for he was two years joint emperor, previously to the death of Augustus.
Tiberius Caesar - This emperor succeeded Augustus, in whose reign Christ was born. He began his reign August 19, a.d. 14, reigned twenty-three years, and died March 16, a.d. 37, aged seventy eight years. He was a most infamous character. During the latter part of his reign especially, he did all the mischief he possibly could; and that his tyranny might not end with his life, he chose Caius Caligula for his successor, merely on account of his bad qualities; and of whom he was accustomed to say, This young prince will be a Serpent to the Roman people, and a Phaethon to the rest of mankind.
Herod - This was Herod Antipas, the son of Herod the Great who murdered the innocents. It was the same Herod who beheaded John Baptist, and to whom our Lord was sent by Pilate. See the account of the Herod family in the notes on Matthew 2:1 (note).
Iturea and Trachonitis - Two provinces of Syria, on the confines of Judea.
Abilene - Another province of Syria, which had its name from Abila, its chief city.
These estates were left to Herod Antipas and his brother Philip by the will of their father, Herod the Great; and were confirmed to them by the decree of Augustus.
That Philip was tetrarch of Trachonitis, in the fifteenth year of Tiberius, we are assured by Josephus, who says that Philip the brother of Herod died in the twentieth year of Tiberius, after he had governed Trachonitis, Batanea, and Gaulonitis thirty-seven years. Antiq. b. xviii. c. 5, s. 6. And Herod continued tetrarch of Galilee till he was removed by Caligula, the successor of Tiberius. Antiq. b. xviii. c. 8, s. 2.
That Lysanius was tetrarch of Abilene is also evident from Josephus. He continued in this government till the Emperor Claudius took it from him, a.d. 42, and made a present of it to Agrippa. See Antiq. b. xix. c. 5, s. 1.
Tetrarch signifies the ruler of the fourth part of a country. See the note on Matthew 14:1.