Bring forth therefore fruits worthy of repentance, and don't begin to say among yourselves, 'We have Abraham for our father;' for I tell you that God is able to raise up children to Abraham from these stones!

 (i) Tiberius was the successor of Augustus and therefore the second of the Roman emperors. As early as A.D. 11 or 12 Augustus had made him his colleague in the imperial power but he did not become sole emperor until A.D. 14. The fifteenth year of his reign would therefore be A.D. 28-29. Luke begins by setting the emergence of John against a world background, the background of the Roman Empire. 