2 Chronicles 26:1, 3-4

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

Uzziah was sixteen years old when he became king, and he reigned in Jerusalem fifty-two years. His mother’s name was Jekoliah; she was from Jerusalem. He did what was right in the eyes of the LORD, just as his father Amaziah had done.