Inside tomb C we find the entrance of a much elder tomb, now known as Tomb C3.
During the campaign of 1923 only the façade with the entrance was excavated.
In front of tomb C3 was a small portico with two pilasters built of brick. The floor under
the portico was paved with a black-and-white mosaic depicting a male figure with his right arm raised, preceded by a lion and two horses. The ceiling has disappeared.
The entrance of tomb C3 includes two brick semicolumns at the corners, and faces
the entrance wall of tomb C. The door has a travertine architrave and door jambs.
The inscription above the door is lost. Tomb C3 had to be entered by two steps.