Second Kings 21:19-26 gives an account of the reign of Amon.
Amon began to reign over Judah at the age of twenty-two and reigned for two years in Jerusalem (v. 19).
Amon did what was evil in the sight of Jehovah, as Manasseh his father had done. He walked in all the way that his father had walked and served the idols that his father had served, forsaking Jehovah and not walking in His way (vv. 20-22).
Amon's servants conspired against him and killed him. The people struck down all the rebels and made Amon's son Josiah king in his place (vv. 23-24).
Amon was buried in his grave in the garden of Uzza (vv. 25-26).
Second Kings 22:1—23:30 describes the reign of Josiah.
Josiah began to reign over Judah at the age of eight and reigned for thirty-one years in Jerusalem (22:1).
Josiah did what was right in the eyes of Jehovah and walked in all the ways of his father David, not turning to the right or to the left (v. 2; 23:25).
In the eighteenth year of his reign, Josiah repaired what was broken in the temple of God (22:3-7).