Who was Edgar Allan Poe’s nemesis and what significant role did he play in Poe’s life?

Rufus Wilmot Griswold. He just thought that he was better than Poe.

Explanation:

The rivalry happened when Griswold succeeded Poe as the editor of a magazine - and Griswold was being paid a higher salary than Poe. Griswold even wrote negative things about Poe when he died and it was not a positive obituary. He wanted to harm Poe's reputation. Griswold thought he was the expert and not Poe. He was known as a critic of Poe and his writings.

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