Hezekiah, son of Ahaz, and twelfth king of Judah was one of the best and most important rulers of his dynasty. He set about abolishing idolatry from his kingdom, destroying - among other things - the brazen serpent which had been removed to Jerusalem, and had become an object of idolatrous worship. He resurrected the Passover celebration and worship in Israel reached a peak that had not been seen since the time of David.
Despite this, however, he did not live in a peaceful era. He was invaded by Judah and his kingdom laid under seige. Ever faithful to God, Hezekiah sought his assistance. And God responded mightily.
That night the angel of the LORD went out and put to death a hundred and eighty-five thousand men in the Assyrian camp. When the people got up the next morning-there were all the dead bodies! So Sennacherib king of Assyria broke camp and withdrew. He returned to Nineveh and stayed there.
One day, while he was worshiping in the temple of his god Nisroch, his sons Adrammelech and Sharezer cut him down with the sword, and they escaped to the land of Ararat. And Esarhaddon his son succeeded him as king. (2 Kings 19:35-37)
In an unprecedented act, he also added 15 years to Hezekiah's life, before Hezekiah finally died, closing his days in peace and prosperity. He had ruled for 29 years and was suceeded by his son Manasseh.