Traditional epistemology has its roots in Plato and the ancient skeptics. One strand emerges from Plato's interest in the problem of distinguishing between knowledge and true belief. His solution was to suggest that knowledge differs from true belief in being justified. Ancient skeptics complained that all attempts to provide any such justification were hopelessly flawed. Another strand emerges from the attempt to provide a reconstruction of human knowledge showing how the pieces of human knowledge fit together in a structure of mutual support. This project got its modern stamp from Descartes and comes in empiricist as well as rationalist versions which in turn can be given either a foundational or coherentist twist. The two strands are woven together by a common theme. The bonds that hold the reconstruction of human knowledge together are the justificational and evidential relations which enable us to distinguish knowledge from true belief.