I think that the line you are referring to from "The Raven" is the fifth line of stanza seven in which the narrator says, "Perched upon a bust of Pallas just above my chamber door..."
The narrator is telling the reader where the raven is in his study. The raven is sitting on a bust of Pallas. This would mean that the raven is sitting on a statue of the upper body (usually only the head and shoulders) of Athena, the Greek goddess of wisdom.
Pallas was the Titan god of Warcraft who was married to Styx. He may have been the father of Athena. Most myths have him being killed by Athena, either in battle or as he was about to violate her. She then took his name.
Perhaps the bust was not of Athena but of the Titan god.
Who knows for sure?