Mary Shelley (1797-1851) was an English novelist. Born the daughter of William Godwin, a novelist and anarchist philosopher, and Mary Wollstonecraft, a political philosopher and pioneering feminist, Shelley was raised and educated by Godwin following the death of Wollstonecraft shortly after her birth. In 1814, she began her relationship with Romantic poet Percy Bysshe Shelley, whom she would later marry following the death of his first wife, Harriet. In 1816, the Shelleys, joined by Mary's stepsister Claire Clairmont, physician and writer John William Polidori, and poet Lord Byron, vacationed at the Villa Diodati near Geneva, Switzerland. They spent the unusually rainy summer writing and sharing stories and poems, and the event is now seen as a landmark moment in Romanticism. During their stay, Shelley composed her novel Frankenstein (1818), a masterpiece of Gothic horror and a defining work of the nineteenth century. Following Percy Bysshe Shelley's drowning death in 1822, Mary returned to England to raise her son and establish herself as a professional writer. Recognized as one of the core figures of English Romanticism, Shelley is remembered as a woman whose tragic life and determined individualism enabled her to produce essential works of literature which continue to inform, shape, and inspire the horror and science fiction genres to this day.