The Palazzo de La Vallée, formerly the convent of St. Rosalie, stands on the site that once included the Iglesia y casa di Montserrat (Boyl palace) of the Spanish Benedictines who, having abandoned their seat in the Castle in 1604, moved near the Bastion of St. James in the Calle de Santa Rosalea (Via Torino), where they founded a hospitio.
Subsequently, Charles Emmanuel III granted the Friars Minor Observant of the convent of St. Mary of Jesus, located outside the walls and undergoing fortification works (former Manifattura Tabacchi), to acquire the church of St. Rosalie as their new headquarters.
Thus began, on April 27, 1741, under the direction of Captain of the Engineer De La Vallée, the Fabrication of the Convent of St. Rosalie, whose plan was to connect the two buildings (Church and Convent) with a large archway, an overpass that bypasses today’s Via Principe Amedeo.
The community of Friars Minor, having abandoned the Convent of St. Mary of Jesus, settled at the new location on April 26, 1749.
Finally, with the promulgation of the “subversive” laws of 1866-67, the Convent of St. Rosalie was forfeited by the State Property Office and in 1867 became the headquarters of the Military Presidium Command, later renamed, starting in 1883 and up to the present day, the Military Command of Sardinia.