PORTA S. GIOVANNI, opening on to the Via Nova Appia, _and near by, to
the right_, the walled-up ancient PORTA ASINARIA, _best seen from the
outside_, through which Belisarius entered Rome, and which the
Isaurian guard betrayed to Totila, December 17, 546. The open we are
now rambling over was anciently called the Mirror. _On the left_ is
the end wall of the dining-hall of the ancient Palace of the Lateran,
on which is a copy of an ancient mosaic of the time of Leo III. _In a
building behind this is the_ SCALA SANTA.