Mary was a novelist who wrote the Gothic novel Frankenstein; or, The Modern Prometheus. She also edited and promoted the works of her husband, the Romantic poet and philosopher Percy Bysshe Shelley (also a suspected Sentientist). Her father was the political philosopher William Godwin and her mother was the philosopher and feminist Mary Wollstonecraft (another suspected Sentientist). Mary was an ethical vegetarian or vegan and seems to have had a naturalistic worldview, generally being considered an agnostic.
Mary on Wikipedia