In Norse mythology, a dwarf who was transformed into a fire-breathing dragon guarding a hoard of treasure.
From Old Norse 'Fáfnir,' a proper name from Norse mythology. The etymology of the original Norse name is debated, possibly relating to Old Norse words for hostile or evil.
Fafnir inspired every dragon hoarder in fantasy literature—from Smaug in Tolkien's 'The Hobbit' to Daenerys's dragons, because Norse mythology's depiction of dragons as intelligent, treasure-obsessed creatures became the template for Western fantasy.
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