Thus, from the tribe of Levi may be counted a heritage that is priestly and filled with holiness, while from the tribe of Judah - to which David and Solomon and the rest of the kings belonged - there shines forth the splendor of a royal descent. And so, by the testimony of the Scriptures, Christ is shown to be at once both king and priest.
-St. Ambrose of Milan, Seven Exegetical Works, 4th Century