he had done by Pekahiah, Kg2 15:28 , this was measure for measure, as the Jews say: and this he did in the twentieth year of Jotham the son of Uzziah; and yet Jotham is said to reign but sixteen years, Kg2 15:33 , this must be reckoned therefore either from the time of his being viceroy, and judging Israel in his father's lifetime, Kg2 15:5 or this was the fourth year of Ahaz, and the twentieth year, reckoning from the time Jotham began to reign, who is the rather mentioned, because as yet the historian had taken no notice of Ahaz.