Renfield

R. M. Renfield is a fictional character who appears in Bram Stoker's 1897 Gothic horror novel Dracula. He is Count Dracula's deranged, fanatically devoted servant and familiar, helping him in his plan to turn Mina Harker into a vampire in return for a continuous supply of insects to consume and the promise of immortality. Throughout the novel, he resides in an asylum, where he is treated by Dr. John Seward.