It is interesting to me too that the his name is Parcival. I hadn't heard it was another spelling of Percival.
Whenever I get a name while channeling I always have the entity/spirit basically "spell it", or syllable by syllable for verification. This was very clearly Parcival. I also found it very odd that during the session I used the English spelling for the word "rumor"! As a side note this seems to be a very advanced race that went underground 3,300 years ago so I wouldn't necesarily expect their names to be something predictable or associated with some particular culture from their past.
I haven't been reading any books of this genre or with medieval characters, settings, etc.
I picture a location of a being I'm channeling, whether they're on a ship, on a different continent, wherever, and I've proven this type of ability during distance healing many times, and even locating a person simply by name. When I connected with Parcival I felt him very far north of me (I'm currently in California) and underground. I envisioned him off the coast of Canada, south of Alaska but a straight line visual like that can vary quite a bit!
I appreciate all the emails and comments I've gotten about the Agarthans. If anyone can think of questions that could help with trust and verification I'd be happy to run them by. I also plan on finding out the city layout, cultural aspects of the Agarthans, etc next time I channel him.