2 Kings 14:23
In the fifteenth year of Amaziah the son of Joash king of Judah Jeroboam the son of Joash king of Israel began to reign in Samaria, and reigned forty and one years. In the fifteenth year of Amaziah the son of Joash king of Judah Jeroboam the son of Joash king of Israel began to reign in Samaria, and reigned forty and one years.
The reign began in the fifteenth year of Amaziah son of Joash king of Judah, when Jeroboam son of Joash king of Israel began to reign in Samaria, and it lasted forty-one years, placing Jeroboam in the succession of Israel's kings after Jehoash. It belongs to the account of Amaziah's reign in Judah, which began well but ended wickedly. It falls within the assigned reading in 2 Kings, and the books of Kings give fuller detail about Israel's history than about Judah's. The history of Israel surrounding it is marked by departure from God through idolatry.
Together with the verses that follow it, it places Jonah's prophetic ministry in the reign of Jeroboam II. It belongs to the period of Israel's expansion and strength, when Syria had served as a buffer state for Israel and Assyria's defeat of Syria left Israel free to expand, a background known from Assyrian records of wars with Syria that accords with the biblical account and unfolds historical details that Kings does not fully explain.
The reign it records was part of the history of the ten tribes, whose kingdom later came to an end when Assyria conquered it in 721-722 B.C.