The Via dei Cappellari is a side street on the west side of the Campo de’ Fiori in Rome. In the past it was longer than it is nowadays and under the name Via Tecta or Porticus Maximae. Like many streets in the area the Via dei Cappellari gets its name from the profession of a number of its inhabitants, in this case the “hat-makers”. The names of the little winding streets are very characteristic, revealing the underlying social background. Via dei Cappellari is hence the "Hatters' Street". The street has also been known under different names, such as the Via dell’Arco dei Cappellari and the Via dei Tebaldeschi. The arch (“arco”) in question still exists and used to lead to a monastery for women who were not nuns. It was also known as the Arco di Santa Margherita. The Tebaldeschi nomer came from a family who owned various palazzi in the street and whose coat of arms, a rose, can still be seen on the Via dei Cappellari no. 13. The building in front, with loggia and tower, was also owned by the Tebaldeschi. The Italian poet Pietro Trapassi, aka Metastasio, was born in the house underneath the arch (no. 29), as a plaque testifies.
Take bus 64 and ask where you have to get off for Campo dei Fiori. Turn left towards the Campo. The Via dei Cappellari is a side street on the right.