Poe's mention of Pallas in a verse from his poem "The Raven" is an example of allusion.  Poe is referring to the Greek goddess of wisdom and, therefore, associating wisdom with the raven itself:   "Perched upon a bust of Pallas just above my chamber door"

Or

Edwin Arlington Robinson also uses allusion when he writes in his poem "Miniver Cheevy": 
"He dreamed of Thebes and Camelot,
 And Priam's neighbors."

Thebes is the ancient city of the "riddle of the sphinx'' fame.
Priam is the aged old king of Troy and Camelot, of course, refers to the legendary kingdom of King Arthur.