In "The Raven," at first the speaker of the poem believes that the raven has come from where?
At first, the speaker is "beguiled" into smiling and then he asks the raven, "Tell me what thy lordly name is on the Night's Plutonian Shore!" The raven will not respond other than to say "Nevermore." Pluto, also known as Hades in classical mythology, was the ruler of the underworld. When the speaker asks the raven what his name is on the Plutonian Shore, he's asking...
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At first the speaker believes that the raven has come from "Night's Plutonian shore!"
This means that he though that the raven was from hell. He tells it to get "thee back into the tempest and the Night's Plutonian shore!"