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 princes of Midian, Evi, and Rekem, and Zur, and Hur, and Reba, who were princes of Sihon, dwelling in the country.
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George Leo Haydock
The princes of Madian. It appears from hence that these were subjects of king Sehon: they are said to have been slain with him, that is, about the same time, but not in the same battle. (Challoner)
After the death of their sovereign, they looked upon themselves as independent. They had reigned before as viceroys of Sehon, being natives of the country, and not come from some other part, like the Amorrhites. (Calmet)