'Kings' in the Bible

and ye shall be brought before rulers and kings for my sake, for a testimony to them and to the nations.

But what went ye out to see? a man clothed in delicate raiment? behold, those who wear delicate things are in the houses of kings.

He says, Yes. And when he came into the house, Jesus anticipated him, saying, What dost thou think, Simon? the kings of the earth, from whom do they receive custom or tribute? from their own sons or from strangers?