The king thereof - No doubt the successor of the king slain at Makkedah Joshua 10:23.
All the cities thereof - i. e. the smaller towns dependent upon Hebron. The expression marks Hebron as the metropolis of other subject towns.
Related Commentaries of Joshua 10:37
Joshua 10:37
37 And they took it, and smote it with the edge of the sword, and the king thereof, and all the cities thereof, and all the souls that were therein; he left none remaining, according to all that he had done to Eglon; but destroyed it utterly, and all the souls that were therein.