This work analyzes the mural painting The Council of Gods, made by the Portuguese artist Cyrillo Volkmar Machado for the ceiling of the ballroom from the Barão de Quintela Palace. This is perhaps his most emblematic work, since it is probably the first time that an artist, within the Portuguese mural painting art, employs a Lusitanian literary source in an interior décor cohesive with new emerging sociability concepts, which emerged in the second half of eighteenth century.