Manasseh was the son and successor of Hezekiah and the thirteenth to ascend the throne of Judah. His reign - for fifty-five years - was the longest any king had ruled in Israel and in this time he succeeded in undoing all the good that his father had done.
He brought in several forms of idolatry, including the occult and witchcraft. He killed off prophets, erected idols in God's temple, and sacrificed his own sons on the altar of a heathen God. It was but a matter of time before God's patience ran out.
So the LORD brought against them the army commanders of the king of Assyria, who took Manasseh prisoner, put a hook in his nose, bound him with bronze shackles and took him to Babylon. In his distress he sought the favor of the LORD his God and humbled himself greatly before the God of his fathers. And when he prayed to him, the LORD was moved by his entreaty and listened to his plea; so he brought him back to Jerusalem and to his kingdom. Then Manasseh knew that the LORD is God.
(2 Chronicles 33:11-13)
He abandoned his idolatrous ways, and enjoined the people to worship Jehovah; but the damage he had done was too great to repair. After Manasseh God pronounced a final judgment on the future of Judah.
When he died, he was buried in the garden of Uzza, rather than in the city of David among his ancestors. He was succeeded by his son Amon.