Note 18 — Chapter III · THE BARBARIAN INVASIONS.
Reading edition
See, among other passages, Varro, De lingua Latina, iv. 34; Cic., Pro Domo, 33; and in the Corpus Iuris Civilis, Dig. i. 5, 17; l. 1, 33; xiv. 2, 9; quoted by Ægidi, Der Fürstenrath nach dem Luneviller Frieden. The phrase 'urbs æterna' appears in a novel issued by Valentinian III.
Tertullian speaks of Rome as 'civitas sacrosancta.'