751 – 735 BC for total 16 year reign
5YHVH struck the king, so that he was a leper to the day of his death. And he lived in a separate house, while Jotham the king’s son was over the household, judging the people of the land.
2 Kings 15:5
32In the second year of Pekah the son of Remaliah king of Israel, Jotham the son of Uzziah king of Judah became king. 33He was twenty-five years old when he became king, and he reigned sixteen years in Jerusalem; and his mother’s name was Jerusha the daughter of Zadok. 34He did what was right in the sight of YHVH; he did according to all that his father Uzziah had done. 35Only the high places were not taken away; the people still sacrificed and burned incense on the high places. He built the upper gate of the house of YHVH.