A possible contact with Han China occurred in 166 when a Roman traveller visited the Han court, claiming to be an ambassador representing a certain Andun (Chinese: ), ruler of Daqin, who can be identified either with Marcus or his predecessor Antoninus. In addition to Republican-era Roman glasswares found at Guangzhou along the South China Sea, Roman golden medallions made during the reign of Antoninus and perhaps even Marcus have been found at Óc Eo, Vietnam, then part of the Kingdom of Funan near the Chinese province of Jiaozhi (in northern Vietnam). This may have been the port city of Kattigara, described by Ptolemy (c. 150) as being visited by a Greek sailor named Alexander and lying beyond the Golden Chersonese (i.e. Malay Peninsula). Roman coins from the reigns of Tiberius to Aurelian have been found in Xi'an, China (site of the Han capital Chang'an), although the far greater amount of Roman coins in India suggests the Roman maritime trade for purchasing Chinese silk was centred there, not in China or even the overland Silk Road running through Persia.