QUOTE (Tang maniac @ Jan 31 2008, 01:46 PM)

You are quite right that their value and functions shifted in China, since most of the coins were found in tombs, serving the burial practice OBOLUS which is buring the dead with a coin in his mouth or hand. And of course in some cases they were used as jewels because some of them had one or two holes, which means they were used as buttons or necklaces.
But the question is how they entered China? It's known that foreign merchants,usually Arabs exchanged it for Chinese goods, but I can't find evidence if Romans themselves reached Tang dynasty China.
There is a separate thread on diplomatic relations between Rome and China, which you will find interesteing, since it has branched a little wider to examine the role of soldiers and merchants. The general consensus from that seems to be that merchants travelled through the Silk Road and by sea, either indirectly at first through the Levantine Coast, and then later directly. Of course Byzantium was the Eastern Roman Empire.
My personal view is that there was an additional trading route that tapped into the Silk Road, but which ended in the Urals or the top of the Black Sea, and that this had been in existence much earlier, since this was the site of a meatllurgical complex through which numerous technological advances made their way to China.
Most of the coinage would have entered China via merchants, therefore. Remmebr that at various times it was common for Roman soldiers to be paid in other than coinage, especially when far from home. Salt was a frequently cited method of payment.