Here is where I read of the possibility the UK royal family has Tang routes. http://en.wikipedia.org/wiki/Ancestry_charts_of_the_current_British_Royal_Family#Questionable_connections
Frankly speaking I really doubt that http://www.theroyalforums.com/forums/f96/british-royal-family-genealogy-3292-5.html and could be considered as any kind of scientific sources. Even "theroyalforums.com" discards possible Chinese connection ( http://www.theroyalforums.com/forums/f96/british-royal-family-genealogy-3292-6.html#post1131418 ).
EDIT: I wonder if anybody could say something about: http://fmg.ac/Projects/MedLands/ARMENIA.htm It seems to be scientific, however it looks like it was a website from early 00s.