Heshbon was the city of Sihon king of the Amorites, who had fought against the former king of Moab and taken all his land as far as the Arnon.

Numbers 21:25
Israel captured all the cities of the Amorites and occupied them, including Heshbon and all its villages.

Numbers 21:27
That is why the poets say: "Come to Heshbon, let it be rebuilt; let the city of Sihon be restored.

Judges 11:26
For three hundred years Israel has lived in Heshbon, Aroer, and their villages, as well as all the cities along the banks of the Arnon. Why did you not take them back during that time?

Song of Solomon 7:4
Your neck is like a tower made of ivory; your eyes are like the pools of Heshbon by the gate of Bath-rabbim; your nose is like the tower of Lebanon, facing toward Damascus.

Jeremiah 48:45
"Those who flee will stand helpless in Heshbon's shadow, because fire has gone forth from Heshbon and a flame from within Sihon. It devours the foreheads of Moab and the skulls of the sons of tumult.

For Heshbon was the city of Sihon the king of the Amorites, who had fought against the former king of Moab, and taken all his land out of his hand, even to Arnon.