Margaret King (1773–1835), also known as Margaret King Moore, Lady Mount Cashell and Mrs Mason, was an Anglo-Irish hostess, and a writer of female-emancipatory fiction and health advice. Despite her wealthy aristocratic background, she had republican sympathies and advanced views on education and women's rights, shaped in part by having been a favoured pupil of Mary Wollstonecraft. Settling in Italy in later life, she reciprocated her governess's care by offering maternal aid and advice to Wollstonecraft's daughter Mary Shelley and her travelling companions, husband Percy Bysshe Shelley and stepsister Claire Clairmont. In Pisa, she continued the study of medicine which she had begun in Germany and published her widely read Advice to Young Mothers, as well as a novel, The Sisters of Nansfield: A Tale for Young Women.

Mary Wollstonecraft was a British writer, philosopher, and advocate of women's rights. Until the late 20th century, Wollstonecraft's life, which encompassed several unconventional personal relationships at the time, received more attention than her writing. Today Wollstonecraft is regarded as one of the founding feminist philosophers, and feminists often cite both her life and her works as important influences.