The Palazzo della Ragione is a historic building of Milan, Italy, located in Piazza Mercanti, facing the Loggia degli Osii. It was built in the 13th century and originally served as a broletto as well as a judicial seat. As it was the second broletto to be built in Milan, it is also known as the Broletto Nuovo . The palace is decorated with a relief representing Oldrado da Tresseno , and the bas relief of the scrofa semilanuta , which has been object of much controversy among scholars of the foundation and origins of Milan.

More details: https://en.wikipedia.org/wiki/Palazzo_della_Ragione%2C_Milan