This small room separates the monumental wing of the palazzo from the private, less richly decorated rooms.

The cross vault, from which the room takes its name, was decorated between 1533 and 1534.

The moulded stuccoes were executed by Biagio de Conti and Benedetto di Bertoldo, while the hand-finished acanthus leaves in the corbels are by Andrea de Conti.

The grotesques in the vault were painted by Gerolamo da Pontremoli in iridescent shades of pink, red, golden yellow and silvery green; the composition shows herms of  Diana Ephesina framed by sphinxes on two opposite segments of the vault, and on the others, pairs of putti holding a medallion.

The lower part of the room was decorated with faux marble and stucco relief by Gerolamo Staffieri of Ticino in 1813.

Volta dipinta nel 1534 da Luca da Faenza Vault painted in 1534 by Luca da Faenza