For Heshbon was the city of King Sihon of the Amorites. Now he had fought against the former king of Moab and had taken all of his land from his control, as far as the Arnon.
TSK
TSK · Joshua 21:39
Treasury of Scripture Knowledge references in NET.
“Ataroth, Dibon, Jazer, Nimrah, Heshbon, Elealeh, Sebam, Nebo, and Beon,
The Reubenites rebuilt Heshbon, Elealeh, Kiriathaim,
It encompassed all the cities of the plain and the whole realm of King Sihon of the Amorites who ruled in Heshbon. Moses defeated him and the Midianite leaders Evi, Rekem, Zur, Hur, and Reba(they were subjects of Sihon and lived in his territory).
As for the Hebronites: Jeriah was the leader of the Hebronites according to the genealogical records. In the fortieth year of David’s reign, they examined the records and discovered there were highly respected men in Jazer in Gilead.
I will weep for the grapevines of Sibmah just like the town of Jazer weeps over them. Their branches once spread as far as the Dead Sea. They reached as far as the town of Jazer. The destroyer will ravage her fig, date, and grape crops.