Edmund Gettier's famous 1963 paper, "Is Justified True Belief Knowledge?", popularized the claim that the definition of knowledge as justified true belief had been widely accepted throughout the history of philosophy. The extent to which this is true is highly contentious, since Plato himself disavowed the "justified true belief" view at the end of the "Theaetetus". Regardless of the accuracy of the claim, Gettier's paper produced major widespread discussion which completely reoriented epistemology in the second half of the 20th century, with a newfound focus on trying to provide an airtight definition of knowledge by adjusting or replacing the "justified true belief" view. Today there is still little consensus about whether any set of conditions succeeds in providing a set of necessary and sufficient conditions for knowledge, and many contemporary epistemologists have come to the conclusion that no such exception-free definition is possible. However, even if justification fails as a condition for knowledge as some philosophers claim, the question of whether or not a person has good reasons for holding a particular belief in a particular set of circumstances remains a topic of interest to contemporary epistemology, and is unavoidably linked to questions about rationality.