This monumental complex was born as a defensive bulwark. Towards the end of 1300, it lost its military function to become a manor house within the land purchased by the Brivios, nobles of Germanic origin whose wealth came from agricultural activities. The name of Rocca derives from the fact that originally the building was one of the defensive bulwarks erected along the Milan - Lodi road in the early Middle Ages, at the time of the wars that pitted the Municipality of Milan against the Municipality of Lodi. The current building was built in 1600 by the Brivio marquises on the ruins of the pre-existing castle. It was at the center of important war episodes, such as the Battle of Marignano in 1515 and in 1859, when on 8 June Napoleon III and Vittorio Emanuele II entered Milan victorious, defeating the Austrians. From an architectural point of view it is a baroque palace built with a rather elaborate scheme: the north-west part houses a noble chapel, rich in typically seventeenth-century stucco and gilding. The entrance has a large portal with a beautifully crafted wrought iron gate, the work of a craftsman from Melegnano from the 1700s, rich in scrolls and arabesques. Since 1996 it has been public property and hosts painting exhibitions, classical music concerts and conferences of national importance in its halls with frescoed ceilings and large fireplaces.