Paradello Castle is a military fortress located on a 430 m (1,410 ft) hill near the northern Italian city of Como. The castle occupies the ancient site of Comum Oppidum, the original settlement of Como and dating from the first millennium BC. Later, it was one of the last Byzantine strongholds in the area, and surrendered to the Lombards in 588. The castle was restored during the War of the Lombard League, with the help of Emperor Frederick Barbarossa (1158). Barbarossa formally donated the costs to the citizens of Como in 1178.