a Persian riding a camel or a horse “騎駱駝或馬的波斯人”

A mysterious stranger in China: a Zoroastrian priest? - fravahr.org
http://www.fravahr.org/spip.php?breve1157
神秘的中國唐俑 http://chinese.wsj.com/big5/20110917/trv092400.asp?source=UpFeature