During most of his long philosophical career, Bertrand Russell was a strong moral subjectivist or emotivist who argued that ethics, because it cannot hope to arrive at truth, is not properly a part of either science or philosophy. In several works, however, most notably Philosophy and Politics and Human Society in Ethics and Politics, he attempted to bring his empiricism and his philosophy of science to bear on moral and other axiological questions. In these writings, he appears to seek and (...) to hope for the "imperium" of the title of this article, which contrasts these two positions, drawing on the former to critique the latter. (shrink)