The Arengario is a historic building in Monza. It was built in the 13th century and is named after its original function as the town's arengario (i.e., town hall). It is located in the most central square of Monza, Piazza Roma.
Its architecture is clearly inspired by that of the Palazzo della Ragione of Milan, with a portico surmounted by a single upper floor that was used for councils. The side of the building facing South has a small stone loggia(added to the main building in 1330) informally known as la Parléra (in Lombard, 'the speaking place'), where the commune's decrees were declaimed to the population. In the 14th century, a bell tower was added, decorated with Ghibelline-styled merlons. In the original building, external stairs led to the upper floor; these have been replaced in 1904 with a new stairway inside the tower.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.