2 Kings 21:24
And the people of the land slew all them that had conspired against king Amon; and the people of the land made Josiah his son king in his stead. And the people of the land slew all them that had conspired against king Amon; and the people of the land made Josiah his son king in his stead.
After Manasseh had been carried to Babylon and released and died, his son Amon reigned and did evil as his father Manasseh had done, and his servants conspired against him and slew him in his own house. Then the people of the land slew all them that had conspired against King Amon and made Josiah his son king in his place, marking the end of Amon's reign and the beginning of Josiah's.
The verse falls within the history of Judah's remaining kingdom after the ten tribes had been swept away, for the books of Kings carry the monarchy's history through to the Babylonian captivity. It belongs to the succession of Judah's kings from Ahaziah, Athaliah, Joash, Amaziah, Azariah or Uzziah, Jotham, Ahaz, Hezekiah, Manasseh, Amon, Josiah, to Jehoahaz, running parallel with the kings of Israel from Joram through Jehu's dynasty to Hoshea and the captivity. It is part of that wonderfully interesting period of nearly 300 years covered in 2 Kings 7 to 23.
The verse contrasts a wicked and weak king with his successor, for the wicked Amon was followed as king of Judah by his son Josiah, a good, devoted and zealous king and reformer. It stands in Judah's spotted record in which the kingdom always prospered under righteous and faithful rulers, yet rulers repeatedly turned from God to gross idolatry and brought calamity upon themselves and their people.
The making of Josiah king begins the one bright chapter of reformation that closes the history of Judah, a reformation conducted under Josiah supported by his godly priests and counselors after the wicked and weak reigns. In Josiah it introduces the king who fulfilled the prophecy concerning him just as the Lord had declared, the prophecy spoken hundreds of years before by the man of God to Jeroboam. Despite his devoted and zealous reformation, Josiah could not stop the people's downward course as the history of Judah drew to its close.