When Samlah died, Shaul from Rehoboth on the Euphrates reigned in his place.
By degrees, it seems, the Edomites wormed out the Horites, obtained full possession of the country, and had a government of their own. 1. They were ruled by kings, who governed the whole country, and seem to have come to the throne by election, and not by lineal descent; so bishop Patrick observes.
Commenting on Genesis 36:31-43
Duke Kenaz, Duke Teman, Duke Mibzar. There was a Kenaz the son of Eliphaz, and so a Teman a son of his, who were both dukes; but these seem to be different from them, though the latter might be duke of the place called Teman from him: which, in Jerom's time (t), was a village five miles distant from Petra, and where was a Roman...
And Samlah died, and Saul of Rehoboth [by] the river reigned in his stead. (h) Which is by the river Euphrates.