| Augustus (31 BCE–14 CE) | | |
| Tiberius (14–37 CE) | | |
| Caligula (37–41 CE) | | |
| Claudius (41–54 CE) | Aulus Plautius (43–47) | |
| Publius Ostorius Scapula (47–52) | |
| Nero (54–68 CE) | Aulus Didius Gallus (52–57) | |
| Quintus Veranius (57–57) | |
| Gaius Suetonius Paulinus (58–62) | |
| Publius Petronius Turpilianus (62–63) | |
| Galba (68–69 CE) | Marcus Trebellius Maximus (63–69) | |
| Otho (January–April 69 CE) | | |
| Aulus Vitellius (July–December 69 CE) | | |
| Vespasian (69–79 CE) | Marcus Vettius Bolanus (69–71) | |
| Quintus Petillius Cerialis (71–74) | |
| Sextus Julius Frontinus (74–78), also a military and technical writer | |
| Titus (79–81 CE) | Gnaeus Julius Agricola (78–85), conqueror of Caledonia | Gask Ridge |
| Domitian (81–96 CE) | Unknown | |
| Sallustius Lucullus (uncertain; 87 – c. 89) | |
| Aulus Vicirius Proculus (fl. 93) | |
| Nerva (96–98 CE) | Publius Metilius Nepos (uncertain; c. 96 – c. 97) | |
| Trajan (98–117 CE) | Titus Avidius Quietus (c. 97 – c. 101) | |
| Lucius Neratius Marcellus (c. 101 – c. 103) | |
| Unknown (c. 103 – 115) | |
| Marcus Appius Bradua (uncertain; 115–118) | |
| Hadrian (117–138 CE) | Quintus Pompeius Falco (118–122) | Hadrians Wall |
| Aulus Platorius Nepos (122 – c. 125) | |
| Trebius Germanus (uncertain; c. 127) | |
| Sextus Julius Severus (c. 131 – c. 133) | |
| Publius Mummius Sisenna (uncertain; c. 133 – c. 135) | |
| Antoninus Pius (138–161 CE) | Quintus Lollius Urbicus (c. 138 – c. 144) | Antonine Wall |
| Gnaeus Papirius Aelianus (c. 145 – c. 147) | |
| Unknown (c. 147 – c. 154) | |
| Gnaeus Julius Verus (c. 154 – c. 158) | |
| Longinus (c. 158 – 161) | |
| Marcus Aurelius (161–180 CE) | Marcus Statius Priscus (c. 161) | |
| Lucius Verus (161–169 CE) (joint emperor) | Sextus Calpurnius Agricola (c. 162 – c. 166) | Hadrians Wall |
| Unknown (c. 166 – 175) | |
| Quintus Antistius Adventus (c. 175 – c. 178) | |
| Commodus (177–192 CE)(partial joint emperor) | Lucius Ulpius Marcellus[1](c. 178 – c. 184) | |
| Marcus Antius Crescens Calpurnianus (acting governor, c. 185) | |
| Publius Helvius Pertinax (c. 185 – c. 187), later Roman Emperor | |
| Unknown (c. 187-91)[2] | |
| Publius Helvius Pertinax (January–March 193 CE) | Decimus Clodius Albinus (c. 191 – c. 197), imperial usurper | |
| Marcus Didius Severus Julianus (March–June 193 CE) | | |
| Septimius Severus (193–211 CE) | Virius Lupus (197 – c. 200) | 208 AD Invasion of Scotland |
| Caracalla (198–217 CE) (joint emperor) | Pollienus Auspex (c. 201) | |
| Marcus Antius Crescens Calpurnianus (acting; c. 202) | |
| Gaius Valerius Pudens (c. 202 – c. 205) | |
| Lucius Alfenus Senecio (c. 205 – c. 207) | |
| Publius Septimius Geta (209–211 CE)(joint emperor) | Gaius Junius Faustinus Postumianus (c. 208 – c. 211) | |
| | |
| Macrinus (217–218 CE) | Gaius Julius Marcus (by 213) | |
| Marcus Antonius Gordianus (by 216) | |
| Elagabalus (218–222 CE) | Modius Julius (by 219) | |
| Tiberius Claudius Paulinus (c. 220) | |
| Marius Valerianus (221 – 222/223) | |
| Severus Alexander (222–235 CE) | Claudius Xenophon (223) | |
| Maximus (by 225) | |
| Claudius Apellinus (sometime during 222–235) | |
| Calvisius Rufus (sometime during 222–235) | |
| Valerius Crescens Fulvianus (sometime during 222–235) | |
| Maximinus (235–238 CE) | Tuccianus (by 237) | |
| Gordian I (March–April 238 CE) | Maecilius Fuscus (sometime during 238–244) | |
| Gordian II (March–April 238 CE) | Egnatius Lucillianus (sometime during 238–244) | |
| Pupienus Maximus (April 22–July 29, 238 CE) | | |
| Balbinus (April 22–July 29, 238 CE) | | |
| Gordian III (238–244 CE) | Nonius Philippus (by 242) | |
| Philip (244–249 CE) | Octavius Sabinus (sometime during 260–269), under the Gallic Empire | |
| Decius (249–251 CE) | | |
| Hostilian (251 CE) | | |
| Gallus (251–253 CE) | | |
| Aemilian (253 CE) | | |
| Valerian (253–260 CE) | | |
| Gallienus (253–268 CE) | | |
| Claudius II Gothicus (268–270 CE) | | |
| Quintillus (270 CE) | | |
| Aurelian (270–275 CE) | | |
| Tacitus (275–276 CE) | | |
| Florian (June–September 276 CE) | | |
| Probus (276–282 CE) | | |
| Carus (282–283 CE) | | |
| Numerian (283–284 CE) | | |
| Carinus (283–285 CE) | | |
| Diocletian (east, 284–305 CE; divided the empire into east and west) | | |
| Maximian (west, 286–305 CE) | | Carausian Revolt |
| Constantius I (west, 305–306 CE) | | 305 AD Invasion of Scotland |
| Galerius (east, 305–311 CE) | | |
| Severus (west, 306–307 CE) | | |
| Maxentius (west, 306–312 CE) | | |
| Constantine I (306–337 CE; reunified the empire) | | |
| Galerius Valerius Maximinus (310–313 CE) | | |
| Licinius (308–324 CE) | | |
| Constantine II (337–340 CE) | | |
| Constantius II (337–361 CE) | | |
| Constans I (337–350 CE) | | |
| Gallus Caesar (351–354 CE) | | |
| Julian (361–363 CE) | | |
| Jovian (363–364 CE) | | |
| Valentinian I (west, 364–375 CE) | | 367 AD Revolt of Picts and Scots |
| Valens (east, 364–378 CE) | | |
| Gratian (west, 367–383 CE; coemperor with Valentinian I) | | |
| Valentinian II (375–392 CE; crowned as child) | | |
| Theodosius I (east, 379–392 CE; east and west, 392–395 CE) | | |
| Arcadius (east, 383–395 CE, coemperor; 395–402 CE, sole emperor) | | |
| Magnus Maximus (west, 383–388 CE) | | |
| Honorius (west, 393–395 CE, coemperor; 395–423 CE, sole emperor) | | Romans leave Britain |
| Theodosius II (east, 408–450 CE) | | |
| Constantius III (west, 421 CE, coemperor) | | |
| Valentinian III (west, 425–455 CE) | | |
| Marcian (east, 450–457 CE) | | |
| Petronius Maximus (west, March 17–May 31, 455 CE) | | |
| Avitus (west, 455–456 CE) | | |
| Majorian (west, 457–461 CE) | | |
| Libius Severus (west, 461–465 CE) | | |
| Anthemius (west, 467–472 CE) | | |
| Olybrius (west, April–November 472 CE) | | |
| Glycerius (west, 473–474 CE) | | |
| Julius Nepos (west, 474–475 CE) | | |
| Romulus Augustulus (west, 475–476 CE) | | |
| Leo I (east, 457–474 CE) | | |
| Leo II (east, 474 CE) | | |
| Zeno (east, 474–491 CE) | | |