During the Reformation, when women's role became a topic of discussion in context to the ongoing Bible studies, women's political power, as well as women's proper Biblical place in other areas, became a subject of debate. Female rule and women's role in politics was itself controversial for some Protestant reformers, most famously in "The First Blast of the Trumpet Against the Monstruous Regiment of Women" by John Knox. At the time, both Scotland and England were governed by female leaders. While in Europe, Knox discussed this issue of gynarchy with John Calvin and Heinrich Bullinger. While Knox believed that gynarchy was contrary to the natural order of things, Calvin and Heinrich believed it was acceptable for women to be rulers when the situation demanded.