Yet the Story Cannot Be Told

You may well be seeing this inscription larger than true size: it is only about 12 cm high and 20 cm wide (the blue pen is exactly 14 cm long). The inscription has been "lined out" in red in the modern period, although it may well have been lined out in Antiquity as well, since the custom is ancient: the purpose then as now was to make an inscription easier to read. (Mind you, modern lining out sometimes makes an inscription much harder to read, if the person who does it can't read it in the first place: see this example in the Umbrian town of Narni.)

Despite the lining out, the shape of the underlying letters can be seen clearly. Notice the exaggerated serifs and the curvy quality of the letters, particularly prominent in the first F and the X: though cut in stone, the inscription is influenced by rather elegant manuscript forms. With no context, I'm going out on a limb, but it must be from the early days of the Empire, no later than maybe A.D. 150.

As for the content of the inscription, it's perfectly straightforward: if you dreamt about a divinity, it was a sign that the god or goddess was requiring your worship. One would like to hear Titus Flavius tell us his dream, though. . . .