Biriciana
About
Biriciana was raised in timber around 90 CE to hold the ground Domitian had newly won north of the Danube, garrisoning roughly three hectares behind earth ramparts. The fort was rebuilt in stone in the mid-second century, well after the 117 CE snapshot, and its museum today displays one of the best-preserved collections of Roman cavalry parade armor ever found.
What happened here
Five hundred men, sometimes a thousand, recruited from a province rather than from citizens, and often stationed a long way from where they were raised. Cavalry units get a bigger fort and far more stabling; the smell tells you which kind you are in before the plan does. The layout copies a legionary fortress at a quarter of the size — headquarters, commander's house, granaries, barracks, a bath house usually built outside the walls because of the fire risk. Duties are patrolling, escorting, customs, and policing rather than pitched battle. After twenty-five years a man is discharged with citizenship for himself and his children, recorded on a bronze diploma he keeps for life. A village grows outside the gate within a decade.
Sources
Roman Maps shows the empire frozen at 11 August 117 CE, the day Trajan died — its moment of greatest territorial extent. Explore the full map →