In 1962, philosopher-scientist Thomas Kuhn coined the term “paradigm shift” to signal a massive change in the way a community thinks about a particular topic. Examples of paradigm shifts include Copernicus’s discovery that the earth revolves around the sun, Einstein’s theory of relativity, and Darwin’s theory of evolution. Each changed the world of thought (some for better, some for worse) in a fundamental way. From a political perspective, Constantine’s Edict of Milan, issued in AD 313, was the beginning of a major paradigm shift that signaled the end of the ancient world and the beginning of the medieval period. That edict legitimated Christianity and impressed upon it the Empire’s stamp of approval.