Son of Jotham, and twelfth king of Judah. He ascended the throne at twenty years of age, and reigned sixteen years, 2 Kings 16:1,2,20. B. C. 738. He was distinguished for his idolatry and contempt of the true God; and against him many of the prophecies of Isaiah are directed, Isaiah 7.1-25. He made his own children pass through the fire to idols; he introduced the Syrian gods into Jerusalem, altered the temple after the Syrian model, and even closed it altogether. Having thus forfeited the aid of Jehovah, he met various repulses in battle with Pekah and Rezin; the Edomites revolted, and the Philistines harassed his borders. He turned yet more away from God in his distress, and sought aid from Pul, king of Assyria. This fatal step made him tributary to Pul, and to Tig-lath-pileser his successor. Ahaz was reduced to great extremities, in buying off the Assyrians; but became more infatuated still in idolatry, and dying in his impiety at the of thirty-six, was refused a burial with the kings his ancestors, 2 Chronicles 28:1-27.