Reba
Reba is one of the five kings of Midian killed by the Israelites in the campaign of vengeance Yahweh commanded after Peor. He appears once in the Numbers account of the slaughter and again in the Joshua summary of the territory.
Among the Five Kings of Midian
The roster of the slain in Numbers names Reba alongside the other four: "And they slew the kings of Midian with the rest of their slain: Evi, and Rekem, and Zur, and Hur, and Reba, the five kings of Midian: Balaam also the son of Beor they slew with the sword" (Nu 31:8). The list explicitly counts five — Reba is the fifth — and ties the killing of these kings to the same campaign that ends Balaam's life.
In Joshua's Territorial Summary
The Joshua land-list reuses the same five names when surveying what fell to Israel east of the Jordan: "and all the cities of the plain, and all the kingdom of Sihon king of the Amorites, who reigned in Heshbon, whom Moses struck with the chiefs of Midian, Evi, and Rekem, and Zur, and Hur, and Reba, the princes of Sihon, who dwelt in the land" (Jos 13:21). Here Reba and the others are described not only as kings of Midian but as "princes of Sihon" who dwelt under his Amorite kingdom — set in their wider political role, and recalled as those Moses struck.