Now in the fifteenth year of the reign of Tiberius Caesar, Pontius Pilate being governor of Judea, and Herod being tetrarch of Galilee, and his brother Philip tetrarch of the region of Ituraea and Trachonitis, and Lysanias tetrarch of Abilene,
It will be noted that Luke cited no less than six notable persons in high office with the Roman empire and also with the Jews, nailing down the historical context of this record with the most dogmatic certainty.  This student has an impression that Luke's citing so many names here was prompted by some uncertainty on his part with regard to the exact meaning of "fifteenth year of Tiberius," knowing perhaps that it could have been counted from either 11 A.D. or 14 A.D.