[andybak]

Which brings to mind the "Persianisation" of everyone who conquered Persia. Not too sure how Alexander fits into this but bear with me).

Maybe it wouldn't be far fetched to argue that Eurasia had only 3 distinct persistent cultures: Romano-Greek, Persian/Islamic/Turkic, and Han. I know this is a gross simplification but it's not a bad framework to begin with.

[adrianratnapala]

He probably didn't fit the pattern. But we might underestimate the Persianisation simply because those aspects of Iranian culture the west took up, no longer look foreign.

Modern mens fashion (suits, pants, waistcoats) seem to have come from the Islamic world, especially Iran.

For example: early Roman emperors reseble latin-American caudillos more than they resemble medieval kings. Later emperors however introduced trappings of Royalty that we would still recognize, often in imitation of Iranian models.