It is to this city that our earliest religious document, the so-called Calendar of Numa, belongs. That calendar includes the cult of Quirinus on the hill which still bears his name, and that hill was an integral part of the city as just described. On the other hand, it tells us nothing of the great cult of the _trias_ on the Capitoline--Jupiter, Juno, Minerva--which by universal tradition was instituted much later by the second Tarquinius, _i.e._ under an Etruscan dynasty; nor does Diana appear in it, the goddess who was brought from Latium and settled on the Aventine before the end of the kingly period. We have, then, a _terminus ex quo_ for the date of the calendar in the inclusion in the city of the Quirinal hill, and a _terminus ad quem_ in the foundation of the Diana temple on the Aventine.[188] We cannot date these events precisely; but it is sufficient for our purpose if it be taken as proved that the Fasti belong to the fully developed city, and yet were drawn up before that conquest by the Etruscans which we may regard as a certainty, and which is marked by the foundations of Etruscan masonry which served to support the great Capitoline temple. And this is also borne out by the undoubted fact that the calendar itself shows no trace of Etruscan influence. But I must now go on to explain exactly what this calendar is. The _Fasti anni Romani_ exist chiefly on stone as inscriptions, and date from the Early Empire, between 31 B.C. and A.D. 51. They give us, in fact, the calendar as revised by Caesar; but no one now doubts that Mommsen was right in detecting in these inscriptions the skeleton of the original calendar which the Romans ascribed to Numa.[189] This is distinguished from later additions by the large capital letters in which it is written or inscribed in all the fragments we possess; it gives us the days of the month with their religious characteristics as affecting state business, the names of the religious festivals which concern the whole state, and the Kalends, Nones, and Ides in each month. Excluding these last, we have the names, in a shortened form, of forty-five festivals; and these festivals, thus placed by an absolutely certain record in their right place in each month and in the year, must be the foundation of all scientific study of the religious practice of the Roman state, taken together with certain additions in smaller capitals, and with such information about them as we can obtain from literary sources.[190]