The small room, which was used as a bedroom by Federico, is full of mythological quotes, starting from the central octagon in which the figure of Phaethon is represented. The decoration and the painting are both extraordinary. The frescoes are certainly the work of Primaticcio (Bologna 1504, Parigi 1570). In the numerous mythological episodes, it is important to highlight the battles on the side, which give the Chamber a chaotic movement. The marble of the fireplace is also very refined, the hood is decorated with a wavy motif, and the marble of the doors is the same used for the Holy Door in Rome.