'Kings' in the Bible

From the time when I put judges over my people Israel; and I will give you peace from all who are against you. And the Lord says to you that he will make you the head of a line of kings.

For you, O Lord of armies, the God of Israel, have clearly said to your servant, I will make you the head of a family of kings: and so it has come into your servant's heart to make this prayer to you.

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

And it came to pass, after the year was expired, at the time when kings go forth to battle, that David sent Joab, and his servants with him, and all Israel; and they destroyed the children of Ammon, and besieged Rabbah. But David tarried still at Jerusalem.