Its most famous portion is the Jerusalem chamber, believed to be named from the former tapestries on its walls, representing the holy city.
The carved wooden doors of both the north and the south portals are masterpieces respectively of Gothic and Renaissance workmanship. The church possesses an elaborate astronomical clock (1866) and tapestries of the 15th and 17th centuries; but its chief artistic treasures are stained glass windows of the 13th, 14th and 16th centuries, the most beautiful of them from the hand of the Renaissance artist, Engrand Le Prince, a native of Beauvais.
In the interior there are several interesting apartments; the chief of these is the ample council chamber with its fine tapestries, where an important wine sale is held annually.
The Museo Civic°, formed in 1903, contains collections of antiquities (though many of the Roman antiquities of Piacenza have passed to the museum of Parma), some good Flemish tapestries and a few pictures.
With worsted in the various kinds of carpets, with cotton in tapestries and household cloths, with line and tow yarns for the same fabrics and for paddings, &c., and with wool for horse clothing.