Hosea was a prophet of the Northern Kingdom. He prophesied during the reigns of seven kings from Jeroboam to Hezekiah between 750 B.C. to the fall of the Northern Kingdom in 721 B.C.
His story is perhaps one of the saddest in the Bible, and very representational of God's love for his people, Israel, who would prostitute itself. Hosea took a wife Gomer, whom he loved dearly. She, however, was unfaithful to him, taking many lovers. Eventually, she left him and their children and went after men who gave her gifts. As time passed, Gomer lost her beauty. Her lovers no longer wanted her and she was reduced to slavery. Hosea sought her out and purchased her back. He forgave her and made her his wife again.
He is the only prophet of Israel who has left any written prophecy.