[364] De Bello Gallico, V. I.
[365] Dio Cassius, XXXIX. 56. XL. 1.
[366] This opinion has been already supported by learned archæologists. I will cite especially M. Mariette; Mr. Thomas Lewin, who has written a very interesting account of Cæsar’s invasions of England; and lastly, M. l’Abbé Haigneré, archivist of Boulogne, who has collected the best documents on this question.
[367] Strabo, IV. 6, p. 173.
[368] According to the Itinerary of Antoninus, the road started from Bagacum (Bavay), and passed by Pons-Scaldis (Escaut-Pont), Turnacum (Tournay), Viroviacum (Werwick), Castellum (Montcassel, Cassel), Tarvenna (Thérouanne), and thence to Gesoriacum (Boulogne). According to Mariette, medals found on the road demonstrate that it had been made in the time of Agrippa; moreover, according to the same Itinerary of Antoninus, a Roman road started from Bavay, and, by Tongres, ended at the Rhine at Bonn. (See Jahrbücher des Vereins von Alterthums Freunden, Heft 37, Bonn, 1864. Now, admitting that there had been already under Augustus a road which united Boulogne with Bonn, we understand the expression of Florus, who explains that Drusus amended this road by constructing bridges on the numerous water-courses which it crossed, Bonnam et Gesoriacum pontibus junxit. (Florus, IV. 12.)
[369] Suetonius, Caligula, 46.—The remains of the pharos of Caligula were still visible a century ago.
[370] Suetonius, Claudius, 17.
[371] Ammianus Marcellinus, XX. 1.
[372] Ammianus Marcellinus, XX. 7, 8.
[373] Eumenius, Panegyric of Constantinus Cæsar, 14.