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As a result of Louis LeVau’s envelope of Louis XIII’s château, the king and queen had new apartments in the new addition, known at the time as the château neuf (new palace). The State Apartments, which are known respectively as the grand appartement du roi and the grand appartement de la reine, occupied the main or principal floor of the château neuf. LeVau’s design for the state apartments closely followed Italian models of the day, as evidenced by the placement of the apartments on the next floor up from the ground level — the piano nobile — a convention the architect borrowed from 16th- and 17th-century Italian palace design.

Le Vau’s plan called for an enfilade of seven rooms, each dedicated to one of the then-known planets and their associated titular Roman deity. LeVau’s plan was bold as he designed a heliocentric system that centered on the salon d’Apollon (Salon of Apollo). The salon d’Apollon originally was designed as the king’s bedchamber, but served as a throne room. The original arrangement of the enfilade of rooms was thus:

Salon de Diane (Diana, Roman goddess of the hunt; associated with the Moon) Salon de Mars (Mars, Roman god of war; associated with the planet Mars) Salon de Mercure (Mercury, Roman god of trade, commerce, and the Liberal Arts; associated with the planet Mercury) Salon d’Apollon (Apollo, Roman god of the Fine Arts; associated with the Sun) Salon de Jupiter (Jupiter, Roman god of law and order; associated with the planet Jupiter) Salon de Saturne (Saturn, Roman god of agriculture and harvest) Salon de Vénus (Venus, Roman goddess of love; associated with the planet Venus) The configuration of the grand appartement du roi conformed to contemporary conventions in palace design.[3] However, owing to Louis XIV’s personal tastes[4] the grand appartement du roi was reserved for court functions — such as the thrice-weekly appartement evenings given by Louis XIV.

The rooms were decorated by Charles LeBrun and demonstrated Italian influences (LeBrun met and studied with the famed Tuscan artist Pietro da Cortona, whose decorative style of the Pitti Palace in Florence LeBrun adapted for use at Versailles). The quadratura style of the ceilings evoke Cortona’s sale dei planeti at the Pitti, but LeBrun’s decorative schema is more complex. In his 1674 publication about the grand appartement du roi, André Félibien described the scenes depicted in the coves of the ceilings of the rooms as allegories depicting the “heroic actions of the king.” Accordingly, one finds scenes of the exploits of Augustus, Alexander the Great, and Cyrus alluding to the deeds of Louis XIV. For example, in the salon d’Apollon, the cove painting “Augustus building the port of Misenum” alludes to the construction of the port at La Rochelle; or, depicted in the south cove of the salon de Mercure is “Ptolemy II Philadelphus in his Library”, which alludes to Ptolemy’s construction of the Great Library of Alexandria and which accordingly serves as an allegory to Louis XIV’s expansion of the Bibliothèque du roi.