The novel links him with the historical figure Vlad the Impaler, a Wallachian prince noted for his unusual cruelty, and suggests that he became a vampire through study of the 'black arts', or occultism.
Contrary to popular belief, the idea of sunlight being fatal to Dracula and other vampires is not found in the folklore or the novel. In the novel, sunlight just weakens vampires. It was the silent film adaption Nosferatu, that gave birth to the idea of sunlight being fatal to vampires.
Most known Dracula film versions
Nosferatu: A Symphony of Horror (1922)
Horror of Dracula (1958) and its sequels
Il Conte Dracula (1970)
Bram Stoker's Dracula (1992)
Van Helsing (2004)