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.