Graeci antiqui multas urbes (Graeceπόλις) cognoverant, quorum notissimae erant Athenae, Corynthus, Sparta, Thebae. Apud Romanos per multas aetates, urbs non addito nomine solum Romam, caput imperii, significabat.[3] Vide exempli gratia dictum "ab urbe condita." Roma ipsa erat prima mundi urbs cuius incolarum numerum millionis adaequabat.
Eo quidem sensu, ut de Roma moenibus cincta diceretur. Cavendum est, ne discrimen certum neglegatur, quod in digestis (50,16,87) constitutum est: Ut 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 habitamus.
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