Moncalieri Castle dates back to the 13th century.It was enlarged during the second half of the 15th century by Jolanda Devalois and again in the late-16th century by Carlo Emanuele I.The castle;as seen today;is the result of alterations commissioned by Vittorio Amedeo I and Cristina of France and carried out during the 17th century by Father Costaguta and Amedeo di Castellamonte.It has been the seat of the "Piedmont" Carabinieri Cadet Battalion since 1848;with the exception of its three royal apartments which house the Piedmont Environment and Architectural Heritage Offices.Fully-restored apartments;formerly belonging to Princess Maria Letizia and King Vittorio Emanuele II;have been open to the public since 1991.