The portico in Piazza di Trevi provides an example of a colonnaded portico. Such porticoes were typical of more lavish styles of housing in medieval Rome. In these porticoes, the columns and architraves are almost always spoils. As these houses were built in rows, some as many as five bays long, the colonnades formed a continuous portico along the street—providing shade, and protection from rain but more importantly their main purpose was to provide space for vendors’ booths.