The decoration that appears along the walls of the porticoed corridor is made up of fragmentary
frescoes
, superimposed on plaster fragments with floral decorations dating back to an earlier period. 
On the southern side, next to the entrance to the
Diæta di Orfeo
, are the best preserved parts of the fresco, where it is possible to find a decoration depicting a line of armed men, 
whose feet, the base of their spear and their coloured oval shields, some also complete with
umbone
, can be seen. 
This type of decoration, which probably alludes to military events in the Dominus’ career, can also be seen on the right wall of the vestibule and recalls the
signum
painted on the right pillar of the
monumental entrance portal
.
