Just east of the Domus Flavia there is another grandiose building to which is usually attributed the name Domus Augustana or Augustiana.

It is likely that only the southern wing, in direct contact with the Circus Maximus, was destined to host the emperor’s private residence; while the northern wing had a more public function. This latter was arranged around a great peristyle with an ornamental basin in the center.

Inside the basin stands a small temple on a raised podium, reachable by a small bridge with masonry arches. The lower floor is arranged around a square courtyard, originally endowed with a two story portico. It opens to the south toward a large exedra, which constitutes the façade toward the Circus Maximus of this part of the palace.

The upper floor, on the other hand, is on the same level as the Domus Flavia, and has a rather complex plan, with numerous rooms almost always of  rather contained dimensions. This was probably the part occupied by the Emperor’s private residence.