The_Gneech said:The vampire-as-romantic-figure pretty much started with Varney the Vampire, IIRC, which was a novel written about a thinly-disguised Lord Byron
Actually, Varney the Vampire was a Victorian-era serial novel potboiler (available online here) which was very much in the vampire-as-disease model.
The novel you're thinking of was The Vampyre, written by Byron's physician, John Polidori, during the same vacation in Switzerland which spawned Frankenstein. The vampire in that novel, Lord Ruthven, was very much a Byron-clone. When the novel was released, it was even mistakenly credited to Lord Byron, in fact, which pissed Polidori off to no end, as he had written it to criticize Byron.
That was the first "romantic" treatment of the vampire, although it was "romantic" more by it's similarity to Byron than any actual intention of the text. It's arguable, however, that it is responsible for planting the seed of romanticism in the vampiric legend which essentially took over in the next century.