Shallum son of Jabesh became king in the thirty-ninth year of Azariah king of Judah. He was king in Samaria for only a month.
Menahem son of Gadi came up from Tirzah to Samaria. He attacked Shallum son of Jabesh and killed him. He then became king.
The rest of the life and times of Shallum and the account of the conspiracy are written in The Chronicles of the Kings of Israel.
Using Tirzah as his base, Menahem opened his reign by smashing Tiphsah, devastating both the town and its suburbs because they didn't welcome him with open arms. He savagely ripped open all the pregnant women.