Journal of Roman Studies. 18: 56–60. doi:10.2307/296044. ↑ Abbott, 272 1 2 Abbott, 273 ↑ Pliny the Elder, Natural Histories XXVIII.5.23. ↑ Abbott, 293 ↑ Goldsworthy, In the Name of Rome, p. 269 ↑ Luttwak, The Grand Strategy of the Roman Empire, p.