Uzziah, son of Amaziah, was the ninth king of Judah. Like his father, Uzziah was a great administrator, politician and warrior. His long reign of 52 years was the most prosperous excepting that of Jehoshaphat.
He defeated the Philistines in battle and subjugated the Ammonites with an army that was very well trained and armed.
In the earlier part of his reign, he was faithful to God, but later he turned prideful. He took it upon himself to burn incense in the Temple, a duty reserved only for priests. The priests warned him about his actions.
Uzziah, who had a censer in his hand ready to burn incense, became angry. While he was raging at the priests in their presence before the incense altar in the LORD's temple, leprosy broke out on his forehead. When Azariah the chief priest and all the other priests looked at him, they saw that he had leprosy on his forehead, so they hurried him out. Indeed, he himself was eager to leave, because the LORD had afflicted him. (2 Chroncles 26:19-20)
The leprosy stayed with him all his life, forcing him to live in a separate house. His son Jotham ruled in his place, and ascended the throne on his death.