Cities: Different Kinds of Royal
Source: TTT
Numbers 21:26
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.
Joshua 10:2
So Adoni-zedek and his people were greatly alarmed, because Gibeon was a great city, like one of the royal cities; it was larger than Ai, and all its men were mighty.
2 Samuel 12:26
Meanwhile, Joab fought against Rabbah of the Ammonites and captured the royal fortress.