The prophecies of Hosea and Amos are part of a collection of books known as the trei asar (The Twelve) or the Minor Prophets. Both prophets were active during the eighth century B.C.E. during the reigns of Jeroboam II of Israel (samaria was the capital city) and Uzziah of Judah. Hosea apparently continued beyond this period through the reigns of Jotham, Ahaz and Hezekiah of Judah. 1 kings chapter 12 verse 2