The room of Saint Ambrose (Salle de Saint-Ambroise) in the apostolic palace (Palais apostolique) at the Vatican (2013).- A polychrome statue of Saint Ambrose by an anonymous artist of the 15th century.-Polyptychs by Nicola da Volturno and Matteo di Tonnazzo.-The grandiose and solemn Apostolic Palace ( palais apostolique ) is a secretive place; forbidden to the public and jealously guarded by the Swiss Guard. It hosts the Holy See administration; the Church's spiritual authorities and before all; the apartments of the Pontiff Sovereign.