1. AUGUSTUS
And it came to pass in those days, that there went out a decree from Caesar Augustus, that all the world should be taxed. (Luke 2:1)
2. TIBERIUS
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 Iturea and of the region of Trachonitis, and Lysanias the tetrarch of Abilene, (Luke 3:1)
Is it lawful for us to give tribute unto Caesar, or no? (Luke 20:22)
3. CLAUDIUS
And there stood up one of them named Agabus, and signified by the Spirit that there should be great dearth throughout all the world: which came to pass in the days of Claudius Caesar. (Acts 11:28)
4. NERO
All the saints salute you, chiefly they that are of Caesar's household. (Philippians 4:22)