King of Judah (2 Kgs. 16; 2 Chr. 28); makes an alliance with Tiglath-pileser, king of Assyria, in order to repel an attack from Syria and Israel; copies heathen altar (2 Kgs. 16: 10); Isaiah's message to (Isa. 7); dial of Ahaz. (2 Kgs. 20: 11; 2 Kgs. 23: 12).