Claim: The Palazzo Bonacolsi (Palazzo Castiglioni) is a 13th-century Gothic-style aristocratic brick palace  built in the late thirteenth century in Mantova, Mantua, region of Lombardy, Italy.by the Pinamonte Bonacolsi.
Evidence: The Palazzo Bonacolsi, also known as Palazzo Castiglioni, is a 13th-century Gothic-style aristocratic palace located in the center of the town in Piazza Sordello in front of the Ducal Palace in Mantua, region of Lombardy, Italy. The palace was built in the late thirteenth century by the Pinamonte Bonacolsi on land purchased from Rolandino de Pacis.