"the line from Burger's 'Lenore'"
Public DomainLeonore - Credit: Johann David Schubert

Leonore is a 1773 German poem by Gottfried August Bürger. It was extremely popular and was an important influence in Romantic literature and, later, vampire literature.

Leonore's fiancé, William, has not returned from the Seven Years' War, and fearing the worst she turns against God. One night, a stranger resembling William appears on a horse and invites Leonore to ride away with him. She agrees, but is soon terrified by the speed they travel. Their destination is the cemetery where William's remains lie; the rider is none other than Death.