I want to know the answer to the following question:
During which time period did Virgil's name become associated with miraclous powers?
All the background I'm provided with is that "The structure known as "Virgil's tomb" is found at the entrance of an ancient Roman tunnel (also known as "grotta vecchia") in Piedigrotta, a district two miles from the centre of Naples, near the Mergellina harbor, on the road heading north along the coast to Pozzuoli.". Is that enough to answer the question?
Answer: no