2 Chronicles 26:1-3

Now all the people of Judah took Uzziah, who was sixteen years old, and made him king in place of his father Amaziah.

He built Eloth and restored it to Judah after the king lay down with his fathers.

Uzziah was sixteen years old when he became king, and he reigned for fifty-two years in Jerusalem; and his mother’s name was Jechiliah of Jerusalem.