The decoration of the pavilion vault of the first antechamber is part of the decorative cycle of the royal apartments executed between 1737 and 1738 for the wedding of Charles and Maria Amalia of Bourbon.

The composition inserts the large central scene above an illusionistic painted architectural system, which expands the spatiality of the environment as it dizzily framed from below, created by Vincenzo Re, set designer of the Court and of the San Carlo Theater, specializing in similar decorative interventions at the main royal residences, such as in the Royal Palace of Portici.ì

The scene in the center of the ribbed vault was painted with an oil-on-plaster technique, which dries faster than the fresco, given the short delivery times of the work. De Mura devised a composition that illusionistically expands on the quadrature, in which the coats of arms of the Bourbons and Saxony held by the Royal Geniuses and positioned under the crown are represented in the center, alluding to the royal wedding. On the left side, the Allegories of the Virtues of Charles (Fortitude, Justice, Clemency or Peace, Magnanimity) and on the right side the Allegories with the Virtues of Maria Amalia (Fidelity, Grandeur or Valor, Prudence, Beauty); below, Hymenaeus chasing away Fury and Malice.