R.M. Renfield was a mental patient under the care of Dr. John (Jack in some cases) Seward. He was diagnosed a "zoophagous maniac" or carnivorous madman, ingesting insects and spiders, believing their life-force would prolong his years. His age in the novel is stated as being 59, but in the many film adaptions his age varies. It is also stated when he was being subdued he showed the strength of a tiger, more a wild beast than human. He is also quite crafty and displays a superior intellect when he is not in a melancholy state or a fit of rage. Dracula brutally killed Renfield for his eventual betrayal.