2 Chronicles 27:4-8

Moreover, he built cities in the hill country of Judah, and he built fortresses and towers on the wooded hills.

He fought with the king of the Ammonites and prevailed over them so that during that year the Ammonites gave him a hundred talents of silver, ten thousand kors of wheat, and ten thousand of barley. The Ammonites also paid him this amount in the second year and in the third.

So Jotham became powerful because he directed his ways before the Lord his God.

Now the rest of the acts of Jotham, all his wars and his ways, behold, they are written in the Book of the Kings of Israel and Judah.

He was twenty-five years old when he became king, and he reigned in Jerusalem for sixteen years.