Archaeologists are looking into the Tuscan sword in the stone. This sword is associated with a vain knight who is given a vision and becomes an hermit. Here's part of the story:
"There, another vision told him to renounce material things. Galgano objected that it would be as difficult as splitting a rock with a sword. To prove his point, he struck a stone with his sword. Instead of breaking, the sword slid like butter into the rock. Galgano once again became a recluse, isolating himself by the sword's side. There he remained until he died in 1181."
Some believe the story is old enough to have influenced the King Arthur legends of Excalibur.