Built in the ninth century, and called S. Maria Nuova. The mosaic on
the apse dates from 862. There is a monument to Gregory XI., and a
relief representing the return of the Papal court to Rome from
Avignon. In the transept are the two stones marked with depressions,
said to have been where Peter knelt when he prayed that Simon Magus
might fall. (See picture in S. Peter's, page 115.) The church contains
a beautiful marble _ciborium_, and monuments to Cardinal Vulcani,
1322, and General Rido, 1475.
_In the Via S. Teodoro is the entrance to_