Lord Ruthven (/ˈrɪvən/) is a fictional character. First appearing in print in 1819, in John William Polidori's "The Vampyre", he was one of the first vampires in English literature. The name Ruthven was taken from Lady Caroline Lamb's Glenarvon, where it was used as an unflattering parody of Lord Byron, while the character was based on Augustus Darvell from Byron's "Fragment of a Novel".
"The Vampyre" was written privately, and published without Polidori's consent, with revisions to the story made by Polidori for an unpublished second edition showing that he planned to change the name from Ruthven to Strongmore. The initial popularity of "The Vampyre" led to the character appearing in many translations and adaptations, including plays and operas, and Ruthven has continued to appear in modern works.