Barbara Tuchman. The mystery of the XIV century (№ 396998)

While the brethren of the free spirit took people of both sexes, the two main treatise was written or formulated by the women. One of them is a mysterious figure, known as sister Katherine (Schwester Katrei), second, Margaret Portansky, who wrote "the Mirror of simple souls", in 1310, was excommunicated and burned along with his creation. In her footsteps followed Helwig, the daughter of a rich Brussels merchant, attracted by its doctrine of fanatical students. In 1372 the Inquisition condemned Joan of Daubenton.