How did Plutarch discuss the decline of the oracle at Delphi?

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In his essay "On the Failure of the Oracles," the Greek biographer Plutarch discusses the decline of the Delphic oracle by linking it to a decline in the population of the region.1

This work is one of three essays Plutarch wrote concerning Delphi, reflecting his deep interest in religious history and antiquarian problems. While "On the Failure of the Oracles" addresses the waning influence of the site, he also authored "On the E at Delphi," which interprets the inscription at the temple entrance, and "On the Pythian Responses," in which he sought to reestablish belief in the oracle's authority.1