fidus Achates

fidus Achates

(ˈfaɪdəs əˈkeɪtiːz)
n
a faithful friend or companion
[Latin, literally: faithful Achates, the name of the faithful companion of Aeneas in Virgil's Aeneid]
References in classic literature ?
The fact was, that Tom's heart had already smitten him for not asking his fidus Achates to the feast, although only an extempore affair; and though prudence and the desire to get Martin and Arthur together alone at first had overcome his scruples, he was now heartily glad to open the door, broach another bottle of beer, and hand over the old ham-knuckle to the searching of his old friend's pocket-knife.