<p>Scant remains of a structure in <i>opus reticulatum</i> stand on the N slope of the *Caelius Mons (Colini). Discovered near the intersection of the present-day Via Annia and Via dei Querceti, the walls form three sides of a rectangular room (Colini pl. 16 E). While too little is preserved to propose the function of the building, the construction technique suggests a late-Republican or early-Imperial date.</p>