Who Was Dr. Frankenstein?

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Was there a real Dr. Frankenstein? Frankenstein, or The Modern Prometheus is considered by many to be the first science fiction novel. It was written in 1816-1817, during a time when bringing the dead back to life was a serious endeavor in scientific circles.
Mary Wollstonecraft Godwin (later Shelley) wrote the book as an exploration of the ethics of such experimentation and brought the question to a wider audience. The model for the character of Dr. Frankenstein could have been any, or several, of a number of actual people.