During the Warring State Period (before the first Chinese Dynasty) one of the famous generals for one of the six warring kingdom had blonde hair. According to the records passed down, his mother was from the north. Europe had many nomadic groups that migrated from one location to another. It would not be inplausible for some to reach the outskirts of the Chinese civilization. Same happens the other way, where does one think the Huns and Mongols originated from?
I’ve read Chinnghis Quan had reddish hair, and green eyes.
The first of several Roman embassies to China, although attributed to Antoninus Pius by the Hou Hanshu (History of the Later Han Chinese dynasty), was probably sent out by Marcus Aurelius. Antoninus Pius died in 161, while the convoy arrived in 166. The confusion arises because Marcus Aurelius took as additional names those of his predecessor, as a mark of respect. The emperor is referred to in Chinese history as "An Tun" (= Antoninus). The mission reached the Chinese capital Luoyang in 166 and was greeted by Emperor Huan of the Han Dynasty.If there were diplomatic relations, you can be sure there were traders as well
LA?