C.I.L., XIV, 2911, was found near this reservoir, and Nibby from this, and a likeness to the construction of the Castra Prætoria at Rome, dates it so (Analisi, p. 503).
This is the opinion of Dr. Esther B. Van Deman of the American School in Rome.
See above, page 29.
There is still another small reservoir on the next terrace higher, the so-called Borgo terrace, but I was not able to examine it satisfactorily enough to come to any conclusion. Palestrina is a labyrinth of underground passages. I have explored dozens of them, but the most of them are pockets, and were store rooms or hiding places belonging to the houses under which they were.