2 Chronicles 27:6 (KJV)

Moreover he built cities in the mountains of Judah, and in the forests he built castles and towers.

He fought also with the king of the Ammonites, and prevailed against them. And the children of Ammon gave him the same year an hundred talents of silver, and ten thousand measures of wheat, and ten thousand of barley. So much did the children of Ammon pay unto him, both the second year, and the third.

So Jotham became mighty, because he prepared his ways before the Lord his God.

Now the rest of the acts of Jotham, and all his wars, and his ways, lo, they are written in the book of the kings of Israel and Judah.

He was five and twenty years old when he began to reign, and reigned sixteen years in Jerusalem.