To stay a little more on topic, it seems to be an undocumented spot in his history, but I think that Feiwong may have actually started out on Sylph. It's much before Wyred's documentation starts, but we had a total moron named Feiwonghong for quite a while, who was an infamous scammer. You can find some records of complaints about him if you go way, way back on the Sylph server forums on Allakhazam:
Allakhazam.com: Final Fantasy XI (link is to the first post I could find regarding him, there are quite a few if you keep reading downwards)