^{page 273 note 1} An example is the emergence of civitates, after an intermediate stage as imperial estate, on the Upper German frontier in Trajanic times (O.R.L. 51, 39): cf. J.R.S. Iv (1965), 224, no. 11 (A.D. 258–68).

^{page 273 note 2} Salway, , The Frontier People of Roman Britain (revised impression, 1967), 181 and 189.Google Scholar

^{page 273 note 3} Tacitus, , Ann. xiii. 54: agrosque vacuos et militum usui sepositos.Google Scholar

^{page 273 note 4} Dio lxxi. 15: not specifically described as military zone but probably such in practice.

^{page 273 note 5} C. G. Starr, The Roman Imperial Navy 2nd edn. 1960), 22 (citing C.I.L. xi. 863 and C.I.L. xi, p. 6).