Probably from G939 (through the notion of a foundation of power); a sovereign ({abstractly} relatively or figuratively): - king.
Verse
Matrix
Luk 7:25But what went ye out for to see? A man clothed in soft raiment? Behold, they which are gorgeously apparelled, and live delicately, are in kings' courtsG934.
1Pe 2:9But ye are a chosen generation, a royalG934 priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light: