In 1999 in a completely unexpected, during recovery work of a church on Via dei Fusari, came to light portions of wall paintings, located in a compartment below the pulpit of the Cathedral. The work of emptying the compartment again have asked about three years and experts around the world, art historians and archaeologists found themselves facing a stunning discovery that would add important new anchors to the history of medieval art. A room painted completely on 180mq. surface of walls dating from the second half of the 1200. Buffered and filled with debris during the 1300 and remained buried and hidden for about 7 years. Exceptional paintings, original colors, subjects and architecture intact were brought to light, giving a further testmonianza of the Sienese School of 1200 and its greatest exponents:
Guido da Siena, Dietisalvi di Speme, Guido di Graziano, Rinaldo da Siena.