The end of the fourteenth century was a time of upheaval and contested authority among the traditional institutions of medieval Europe. In response to these conditions, a number of people began to claim their own authority, as prophets speaking the word of God. They came from outside of the clerical elite and were mostly women and reformers. This book examines the battle over authority which ensued. Prophetic women and other non-elites successfully used prophecy to exert influence and to enter the corridors of power, while educated male clerics insinuated that prophecy was the product of demonic influence and therefore a hazard to the public. Surprisingly, a third faction also emerged--an international network of clerical men who wrote in support of female prophecy. This volume traces the arguments made by these three groups, the clashes that erupted, and the long-term impacts of this battle on ideas of spiritual authority.