Josiah was the most godly king, but even he was not perfect.

2 Kings 23:29. In his days Pharaoh Necho king of Egypt went up against the king of Assyria to the river Euphrates and king Josiah went against him and when he saw him he slew Josiah at Megiddo. (Revelation 16:16) 30. And his servants carried him dead from Megiddo in a chariot and brought him to Jerusalem and buried him in his own sepulcher. And the people of the land took Jehoahaz the son of Josiah and anointed him, and made him king in his father’s stead.