The answer is: Joshua

2 Kings 23:8

When we think of King Josiah, we can't overlook the impact he had on Jerusalem's community and governance. As the last of the righteous kings of Judah, Josiah worked diligently to restore worship to Yahweh and eliminate the remnants of idol worship. One of the pivotal figures during this time was indeed Joshua, whose role as governor was crucial to helping Josiah implement the sweeping reforms outlined in 2 Kings 23.

Now, here’s where things get even more interesting. While Josiah was known for rediscovering the Book of the Law—possibly a portion of what we now know as Deuteronomy—this discovery sparked a national spiritual revival that included not just reforms in nutty odd places like the temple but a cultural reinstitution of covenantal practices. Using Joshua's leadership infused a sense of accountability to these reforms, as he managed the governance during a turbulent period, where political and religious influences were often in conflict.

Furthermore, this time marks the last period of relative monotheistic purity in Judean history. After Josiah died in battle against the Pharaoh Necho II, things drastically changed, leading ultimately to the destruction of Jerusalem and the Babylonian exile a few decades later. Joshua, while lesser-known today, serves as a fascinating example of how local governance played a critical role in supporting broader spiritual transformations within a community.