The reader has in his hands the first historical and spiritual biography of Catherine of Siena (1347-1380), saint and doctor of the Church. In this work, André Vauchez draws the portrait of this passionate woman and travels his itinerary, with great detail, through the epidemic of the Black Death, the Hundred Years War, the fratricidal struggles in Italy or the exile of the potatoes in Avignon. With this book, we revive in our imagination this Dominican penitent who became the correspondent, the confidante and the critical voice of the powerful, the princes, the kings and the pontiffs. It required the knowledge, talent and sensitivity of this eminent medievalist, to get us to penetrate the existential truth of an exceptional woman - beyond the varied faces that have been lent to her through the ages - and so that We could recover the news of your person and your message.