'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 who were servants of Hadadezer saw that they were overcome by Israel, they made peace with Israel and became their servants. So the Aramaeans, in fear, gave no more help to the children of Ammon.

Now in the spring, at the time when kings go out to war, David sent Joab and his servants and all Israel with him; and they made waste the land of the children of Ammon, and took up their position before Rabbah, shutting it in. But David was still at Jerusalem.