2 Kings 16:1

“In the seventeenth year of Pekah the son of Remaliah Ahaz the son of Jotham king of Judah began to reign.] Jotham began to reign in the second of Pekah, and he reigned sixteen years, and therefore his last year would fall in the eighteenth of Pekah; but as his first year might be at the beginning of the second of Pekah, his last was towards the end of the seventeenth of Pekah’s, as here; (see <121532>2 Kings 15:32).”

“AHAZ' WICKED REIGN OVER JUDAH. (2Ki. 16:1-16) Ahaz . . . did not that which was right in the sight of the Lord--[See on Ch2 28:1.] The character of this king's reign, the voluptuousness and religious degeneracy of all classes of the people, are graphically portrayed in the writings of Isaiah, who prophesied at that period. The great increase of worldly wealth and luxury in the reigns of Azariah and Jotham had introduced a host of corruptions, which, during his reign, and by the influence of Ahaz, bore fruit in the idolatrous practices of every kind which prevailed in all parts of the kingdom (see Ch2 28:24).”

“16:1-2 The seventeenth year of King Pekah’s reign was 735 BC. At that time Ahaz . . . began to rule: He had already been co-regent for eleven years, but now he officially acceded to the throne. This marks the transition from subordination to his father, Jotham (743–735 BC), to a position of reigning in his stead (735–732 BC). Ahaz presumably had his official accession ceremony following his father’s death in 732 BC, so the author of Kings reckons Ahaz’s reign of sixteen years from 731 BC, the year after his father died, to 715 BC. See also study note on 17:1.”

“seventeenth: Kg2 15:27-30, Kg2 15:32, Kg2 15:33 Ahaz: Kg2 15:38; Ch2 28:1-4; Isa 1:1, Isa 7:1; Hos 1:1; Mic 1:1 4 Kings (2 Kings) 16:2”

“Kg2 16:1-2 On the time mentioned, "in the seventeenth year of Pekah Ahaz became king" see at Kg2 15:32. The datum "twenty years old" is a striking one, even if we compare with it Kg2 18:2. As Ahaz reigned only sixteen years, and at his death his son Hezekiah became king at the age of twenty-five years ( Kg2 18:2), Ahaz must have begotten him in the eleventh year of his age. It is true that in southern lands this is neither impossible nor unknown, (Note: In the East they marry girls of nine or ten years of age to boys of twelve or thirteen (Volney, Reise, ii. p. 360). Among the Indians husbands of ten years of age and wives of eight are mentioned (Thevenot, Reisen, iii. pp. 100 and 165). In…”