'Kings' in the Bible

And all the kings that were servants to Hadarezer saw that they were routed before Israel, and they made peace with Israel, and served them. And the Syrians feared to help the children of Ammon any more.

And it came to pass, at the return of the year, at the time when kings go forth, that David sent Joab, and his servants with him, and all Israel; and they laid waste the land of the children of Ammon, and besieged Rabbah. But David abode at Jerusalem.