When was the book Frankenstein published?

The Modern Prometheus the actual name of the novel known as Frankestein was firt published in March 1818. It was written while Mary Shelley and husband Percy were vacationing in Europe. While the two where visiting Lord Byron at his home on Lake Geneva in Switerland in June 1816, Byron challenged his guests, the Shelleys and several other prominent writers, to come up with a ghost story. Mary's contribution, she claimed, rose out of a dream.