2 Kings 15:5

And the Lord smote the king, touching him with sickness for overstepping his authority and trespassing upon the function of the priests, 2 Chronicles 26:16, so that he was a leper unto the day of his death, and dwelt in a several house, apart from other people, since lepers were unclean and excluded from the society of men, Leviticus 13:46. And Jotham, the king's son, was over the house, he was regent, he had charge of the administration, judging the people of the land, the representative of his father in the most important office in the land.