Achates
Achates (agate) In Roman mythology, the faithful friend of the hero Aeneas in Vergil’s Aeneid. His devotion to Aeneas was so great that the term fidus Achates (faithful Achates) became synonymous with loyalty.
SOURCE:
Encyclopedia of World Mythology and Legend, Third Edition – Written by Anthony S. Mercatante & James R. Dow– Copyright © 2009 by Anthony S. Mercatante