[MARCELLUS libro duodecimo digestorum. ] §50.16.87.prUt Alfenus ait, 'urbs' est 'Roma', quae muro cingeretur, 'Roma' est etiam, qua continentia aedificia essent: nam Romam non muro tenus existimari ex consuetudine cotidiana posse intellegi, cum diceremus Romam nos ire, etiamsi extra urbem habitaremus.
[MARCELLUS, Digests, book 12.] As Alfenus says, 'Rome' is the 'city' (urbs) which is enclosed by a wall, and 'Rome' is also where there are continuous buildings; for it can be understood from daily custom that 'Rome' is not thought of as extending only as far as the wall, since we say that we are going to Rome even if we live outside the city.