The excavation of the central courtyard of the stabulum, created after 62 A.D. within the “House of the Exedra” identified the building’s ancient atrium. The opus signinum impluvium was perfectly conserved and four building phases were identified dating to between the mid 2nd century B.C. and the post -earthquake period. A particular aspect of the structure is constituted by atrium ’s floor level which, until the mid Imperial period, remained notably lower (c. -0,90 m) than that of the surrounding rooms. The excavation also documented a series of previously unknown interventions dating to the time of the 19th century excavations. (Francesco Panzetti)