2 Kings 16:2

Twenty years old [was] Ahaz when he began to reign, and reigned sixteen years in Jerusalem, and did not [that which was] right in the sight of the LORD his God, like David his father.

Ver. 2. When he began to reign,] i.e., Himself alone after his father's death; in whose lifetime he had been designed to the kingdom, and then he was but twenty years old. Or, When he, that is, Jotham, began to reign. See the like, 2 Chronicles 36:9 .

And reigned sixteen years.] But had an ill life of it all the while, by reason of oppressions and miseries.