Genesis 36:23 lists the kings who ruled in the land of Edom before any Israelite king ruled. This genealogy highlights the historical context and lineage of the Edomite people, showcasing their leadership structure and succession of rulers. It serves as a record of the early rulers in the region, setting the stage for the interactions between the Edomites and the Israelites in later biblical narratives. The verse provides insight into the political landscape of the time and the establishment of dynasties within the Edomite culture.