Greek Basileus basileōn. A Hebraic superlative construction ("X of Xs" meaning "the supreme X"), built into imperial language of the ancient Near East — Persian emperors styled themselves shah-en-shah, "king of kings." The Bible strips the title from human emperors and gives it to the Lamb. It appears three times in Revelation (17:14, 19:16) and once applied to God the Father (1 Timothy 6:15).
King of kings is a direct political claim. Every earthly throne is sub-throne; every parliament is sub-parliament; every constitution lives under a higher constitution whose author is Christ. In Revelation 19 He rides out on a white horse, His robe dipped in blood, and written on the robe and on the thigh is Basileus basileōn kai Kyrios kyriōn — King of kings and Lord of lords. Handel caught it exactly: the Hallelujah Chorus isn't just praise, it's coronation. Modern Christians who treat political loyalty as equal-rank with loyalty to Christ have fundamentally misread the title. Caesar gets coin; Christ gets crown. Every knee bows (Philippians 2:10-11), willingly or eventually; the nations are His inheritance (Psalm 2:8). The only question is whether you kiss the Son now in faith or later in terror.