fidus Achates
(ˈfaɪdəs əˈkeɪtiːz) na faithful friend or companion
[Latin, literally: faithful Achates, the name of the faithful companion of Aeneas in Virgil's Aeneid]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014