'My Lord the King' in the Bible

And Joab said, Jehovah make his people a hundred times as many as they are: but, my lord the king, are they not all my lord's servants? why doth my lord require this thing? why will he be a cause of guilt unto Israel?

And Ornan said unto David, Take it to thee, and let my lord the king do that which is good in his eyes: lo, I give thee the oxen for burnt-offerings, and the threshing instruments for wood, and the wheat for the meal-offering; I give it all.