Murray combined testimony from several witch trials to arrive at the idea that witches met four times per year at coven meetings or "Sabbaths". She also used one piece of testimony to arrive at the conclusion that covens were usually composed of 13 witches, led by a male priest who would dress in animal skins, horns, and fork-toed shoes to denote his authority (the dress was assumed to be a naturalistic explanation for accused witch's descriptions of Satan). The "Grand Master", according to Murray, not only represented the Horned God but was believed to fully embody him, allowing his presence at the Sabbath. She wrote: