The myth of San Guglielmo says that Guglielmo di Malavalle, who lived in the twelveth century, killed dragons and performed many miracles. Vetulonia remembers this saint, hermit and knight with an interesting ceremony.
A pleasant walk is the best way for visitors to Vetulonia to enjoy this medieval village with its remains of an Etruscan wall and rich necropolises which have yielded the oldest Etruscan stone sculptures.