James Malcom Rymer and Thomas Peckett Prest: Varney the Vampire; or, the Feast of Blood (1847, E. Lloyd)
It is one of the often cited "Penny Dreadfuls". According to a bibliography by Montague Summers the first publication as a novel had 220 chapters and 868 pages. Before this it was sold as weekly pamphlets. Summers says that it was written by Prest, E. F. Bleier says Rymer. Its influence on vampire fiction is naturally huge and the character is often cited in later vampire stories, from Marvel comics to Kim Newman.
Here are a few illustrations taken from a German translation of 1976. The illustrator is uncredited, but they seem to be lifted from the original pamphlets or the compilation as a novel.