Midian Descendants of Abraham through Keturah; Genesis 25:2. Midian's territories were to the south of Edom, just northeast of the Gulf of Aqaba. At this time, Moses was already making plans to attack Midian (Josephus, Antiquities 4:6:1). Although Midian and Moab were hereditary enemies, they made peace out of fear of Israel (Sanhedrin 105a).
then... Some say that Balak had been one of Sichon's generals, and now that Sichon had been killed, he had just been appointed king over Moab (Tanchuma 4; Sh'muel HaChasid). Other sources indicate that kings of the area would come from Midian and Moab on an alternating basis (Targum Yonathan).
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