2 Chronicles 26:1, 3-4

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

Sixteen years old was Uzziah when he began to reign, and he reigned fifty and two years in Jerusalem. His mother's name also was Jecoliah of Jerusalem. And he did that which was right in the sight of the LORD, according to all that his father Amaziah did.