King Hezekiah was one of the most beloved kings of Israel, despite a rocky reign that saw the Assyrians take most of Judah. Hezekiah built up Jerusalem (many of his works can still be seen today, including a tunnel under the city) and instituted a series of religious reforms to centralize the worship of Yahweh at the Temple in Jerusalem — another big step towards monotheism.
Timeframe: ~701 BCE