Gregory the Great
Catena Aurea · Lukasevangelium 3
Now in the fifteenth year of the reign of Tiberius Cæsar, Pontius Pilate being governor of Judæa, and Herod being tetrarch of Galilee, and his brother Philip tetrarch of Ituræa and of the region of Trachonitis, and Lysanias the tetrarch of Abilene, Annas and Caiaphas being the High Priests, the word of God came unto John the son of Zacharias in the wilderness.
(Hom. 20. in Ev.) The time at which the forerunner of the Saviour received the word of preaching, is marked by the names of the Roman sovereign and of the princes of Judæa, as it follows: Now in the fifteenth year of the reign of Tiberius Cæsar, Pontius Pilate being governor of Judæa, and Herod being tetrarch of Galilee, &c. For because John came to preach Him who was to redeem some from among the Jews, and many among the Gentiles, therefore the time of his preaching is marked out by making mention of the king of the Gentiles and the rulers of the Jews. But because all nations were to be gathered together in one, one man is described as ruling over the Roman state, as it is said, The reign of Tiberius Cæsar.