The argument at the root of this whole chapter is old: that women's subordination is a human arrangement, not a natural law. As far back as 1405, the writer Christine de Pizan built a literary "City of Ladies" to refute the misogyny of her age. But the modern case sharpened during the Enlightenment, when revolutions in America and France proclaimed the "rights of man" — and pointedly left women out. Olympe de Gouges called the bluff in 1791, rewriting the French Declaration to include women; her radicalism (on women's rights and against slavery) helped send her to the guillotine in 1793.
The text that endured was Mary Wollstonecraft's A Vindication of the Rights of Woman (1792). Its core demand sounds modest now and was incendiary then: that women are not naturally frivolous or lesser, but are made so by being denied education — and that, given reason and schooling, they are men's equals in mind. ("Who made man the exclusive judge," she asked, "if woman partake with him the gift of reason?") The book was reasonably well received in 1792; Wollstonecraft's reputation was wrecked only later, when posthumous revelations about her unconventional private life were used to discredit the ideas.
These early voices matter because they reframed the entire question. Before them, women's lesser status could be waved away as simply how things were. After them, it was an argument someone had to defend — and arguments can be lost. The manifesto came first. The movement came next.