For example:
Mommsen, Theodor. (1999) A History of Rome Under the Emperors, Barbara Demandt, Alexander Demandt, Thomas E. J. Wiedemann, Routledge Key Guides, Routledge, p. 656. ISBN 978-0-415-20647-1. “The result of Constantinople's founding was the end of a national basis for the Empire [...] Milan and Ravenna had been unable to compete with Rome, though they were court residences, but Nova Roma could.”.
Note for example Kantorowicz, Ernst Hartwig. (1957) The King's two bodies: a study in mediaeval political theology, 7‑a eldono, Princeton University Press, p. 568. ISBN 978-0-691-01704-4. “Thus it happened that 'Rome' migrated from incarnation to incarnation, wandering first to Constantinople and later to Moscow, the third Rome, but also to Aachen where Charlemagne built a 'Lateran' and apparently planned to establish the Roma futura. [...] Constantinople and Aachen and others claimed to be each a nova Roma[...]”.
Neville, Peter. (2004) Mussolini, Historical Biographies Series. Routledge, p. 237. ISBN 978-0-415-24989-8. “Mussolini made immense efforts to portray an image of Italian greatness, and the memory of Ancient Rome was constantly traded on in the régime's propaganda. Thus the normal handshake [...] was replaced by the 'Roman Salute' and the Mediterranean became 'our sea'. [...] Some streams in Fascism demanded spiritual revival based on the concept of a 'New Rome'.”.
