"When they meet each other in the streets, you may know if the persons meeting are of equal rank by the following token: if they are, instead of speaking, they kiss each other on the lips. In the case where one is a little inferior to the other, the kiss is given on the cheek; where the difference of rank is great, the inferior prostrates himself upon the ground. Of nations, they honor most their nearest neighbors, whom they esteem next to themselves; those who live beyond these they honor in the second degree; and so with the remainder, the further they are removed, the less the esteem in which they hold them. The reason is that they look upon themselves as very greatly superior in all respects to the rest of mankind, regarding others as approaching to excellence in proportion as they dwell nearer to them; whence it comes to pass that those who are the farthest off must be the most degraded of mankind. Under the dominion of the Medes, the several nations of the empire exercised authority over each other in this order. The Medes were lords over all, and governed the nations upon their borders, who in their turn governed the States beyond, who likewise bore rule over the nations which adjoined on them. And this is the order which the Persians also follow in their distribution of honor; for that people, like the Medes, has a progressive scale of administration and government." (Encyclopedia of Ancient Persia)
Herodotus on Ancient Persia: How Important Decisions Made
