Throughout history, some books have changed the world. They have transformed the way we see ourselves - and each other. They have inspired debate, dissent, war and revolution. They have enlightened, outraged, provoked and comforted. They have enriched lives - and destroyed them. Now Penguin brings you the works of the great thinkers, pioneers, radicals and visionaries whose ideas shook civilization and helped make us who we are. Pioneering female writer Christine de Pizan's spirited defence of her sex against medieval misogyny and literary stereotypes is now recognized as one of the most important books in the history of feminism, and offers a telling insight into the role of women in a man's world.