According to the Bible Hezekiah took the throne at the age of twenty-five (2 Chronicles 29:1) and reigned for twenty-nine years (2 Kings 18:2). Some writers have proposed that Hezekiah served as coregent with his father Ahaz for about fourteen years from 729 BC. His sole reign has been dated by Albright from 715 – 687 BC or 716 – 687 BC according to Thiele, the last ten years of which were as coregent with his son Manasseh.
According to the Bible Hezekiah introduced religious reform and reinstated religious traditions. He set himself to abolish idolatry from his kingdom, and among other things which he did to this end, he destroyed the "brazen serpent," which had been relocated at Jerusalem, and had become an object of idolatrous worship.
According to the work of archaeologists and philologists, the reign of Hezekiah saw a notable increase in the power of the Judean state. There were increases in literacy, in the produciton of literay works and an expansion of the population of Jerusalem where the western subburs were enclosed by the Broad Wall.