Jehoash son of Jehoahaz became king over Israel in Samaria. This was during the 37th year that Joash was king of Judah. Jehoash ruled Israel for 16 years.
All the great things that Jehoash did, including how he fought against Amaziah king of Judah, are written in the book The History of the Kings of Israel.
Jeroboam son of Jehoash king of Israel began to rule in Samaria during the 15th year that Amaziah son of Joash was king of Judah. Jeroboam ruled 41 years.