The empire reaches its greatest territorial extent

Assembled from 46 blocks · 2 evidence · 36 related

1. Story
2. At Trajan's death the empire nominally includes Dacia, Armenia, Assyria and Mesopotamia. His successor Hadrian abandons the eastern conquests almost immediately. The retreat is the informative part: the limit of the empire was not the limit of its armies but the limit of what could be supplied, garrisoned and administered at the speed information travelled.
3. Knowledge
4. The Roman Road Network
5. The Roman Legion
6. Hadrian's Wall
7. Trajan (Marcus Ulpius Traianus)
8. The empire reaches its greatest territorial extent
9. Connections
10. Hadrian's Wall
11. Trajan (Marcus Ulpius Traianus)
12. The Roman Road Network
13. The Roman Legion
14. Hadrian's Wall
15. Roman Citizenship (civitas Romana)
16. Construction of Hadrian's Wall begins
17. The empire reaches its greatest territorial extent
18. The Mediterranean Sea (Mare Nostrum)
19. The Roman Legion
20. Via Appia
21. Londinium
22. Construction of the Via Appia begins
23. The empire reaches its greatest territorial extent
24. Digital mapping shows most of the Roman road network is unlocated
25. Rome
26. Roman Citizenship (civitas Romana)
27. The Roman Road Network
28. Hadrian's Wall
29. Augustus (Gaius Octavius / Imperator Caesar Divi Filius Augustus)
30. Gaius Julius Caesar
31. Caracalla (Marcus Aurelius Antoninus)
32. The Punic Wars
33. Caesar crosses the Rubicon
34. The Augustan settlement: Octavian becomes Augustus
35. Construction of Hadrian's Wall begins
36. The empire reaches its greatest territorial extent
37. The Antonine Constitution (Constitutio Antoniniana)
38. Alaric's Goths sack Rome
39. Odoacer deposes Romulus Augustulus - the contested 'fall' of the Western Roman Empire
40. The empire reaches its greatest territorial extent
41. The Roman Legion
42. Construction of Hadrian's Wall begins
43. The empire reaches its greatest territorial extent
44. Evidence
45. Network models place total Roman road length between roughly 80,000 km (major viae only) and c. 192,861 km across c. 7,154 modelled segments at the empire's peak, depending on inclusion criteria. A 2025 mapping effort reported that the exact course of only about 2.7% of the network is known with certainty.
46. An imperial legion had a nominal strength of c. 5,000-6,000 men in ten cohorts, with roughly equal auxiliary numbers alongside. Total army strength is reconstructed as c. 250,000 under Augustus rising to a peak of roughly 450,000 by 211 CE in c. 33 legions and c. 400 auxiliary units. All totals are modern reconstructions from unit lists, not from any surviving muster roll.