Time Slave is a 1975 hybrid of historical fiction and science fiction by philosopher John Norman. In this book, Norman presents his personal theories of human evolution, exemplified by the case of a modern woman sent back in time twenty thousand years or more; he mourns the loss of human evolutionary fitness and distortion of "natural" social relations which in his view occurred when farming spread, and farmers squeezed hunter/gatherers to the ecological margins. Time Slave features Norman's social philosophy of male-dominance (as also in the Chronicles of Gor), and expresses an unexplained connection between female sexual subordination and the speeding up of the development of space travel.