Mazzancolli Palace is one of the most important examples of medieval architecture in Terni. It was built in the mid-1400s, by the Mazzancolli family, who wanted their power and influence to be immortalized in stone. Ludovico Mazzancolli was Bishop of Terni ( from July 1406 to July 1458), his brother Ettore, was a notary of the municipality's chamberlain and Prior. It was Giovanni, one of Ettore’s three sons, the auditor of the Apostolic Chamber, and the most powerful member of family who wanted the building constructed. It was erected on the base of two pre-existing towers, and the family coat of arms, an arm holding a club resting on a neck, was incorporated in the façade. The Mazzancolli family left Terni in the early 1600s and the palace, by then owned by the Montani-Leoni family, was virtually abandoned for almost a century. In the nineteenth century it was used in the process of silk processing for the Terni steam mill. It was restored after the events of 1870 by the architect Benedetto Faustini (Terni 1836-1895) as the seat of Monte di Pietà. Abandoned again, it was restored in 1926 by the architect Gaetano Coppoli who transformed it into "Casa del Fascio". After the events of 1945 the property passed to the State Property Office which, in the late nineties, entrusted it to the State Archive of Terni, which has had its headquarters here since 2002.