'Chiefs' in the Bible

But the chiefs of the children of Ammon said to Hanun their lord, Does it seem to you that David is honouring your father by sending comforters to you? has he not sent his servants to go through the town and make secret observation of it, and overcome it?

And three of the thirty chiefs went down, and came to David in the harvest time to the cave of Adullam, when the troop of the Philistines was encamped in the valley of Rephaim.