Frommer's Review
This little church was begun in the 6th century but was subsequently rebuilt, and a Romanesque campanile was added at the end of the 11th century, although its origins go back to the 3rd century. The church was destroyed several times by earthquakes or by foreign invasions, but it has always been rebuilt.
People come not for great art treasures, but to see the "Mouth of Truth," a large disk under the portico. As Gregory Peck demonstrated to Audrey Hepburn in the film Roman Holiday, the mouth is supposed to chomp down on the hands of liars who insert their paws. (According to local legend, a former priest used to keep a scorpion in back to bite the fingers of anyone he felt was lying.) The purpose of this disk (which is not of particular artistic interest) is unclear. One hypothesis says that it was used to collect the faithful's donations to God, which were introduced through the open mouth.
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