In Celtic mythology, Argadnel is one of the Islands of the Earthly Paradise that were visited by Bran the Blessed. In 2003, the International Astronomical Union adopted the name for a regio of Europa. ... Found on http://en.wikipedia.org/wiki/Argadnel
1) Celtic mythology 
In Celtic mythology, Argadnel is one of the Islands of the Earthly Paradise that were visited by Bran the Blessed. In 2003, the International Astronomical Union adopted the name for a regio of Europa. ...