The Roman army constructed both temporary and permanent forts and fortified military camps (castrum) across the frontiers of the empire's borders and within territories which required a permanent military presence to prevent indigenous uprisings. Although given basic defensive features, forts were never designed to withstand a sustained enemy attack but rather to provide a protected place for accommodation and storage facilities for food, weapons, horses, and administrative records. Over the centuries Roman forts took on a remarkably standardised layout, and the impressive gates and ruins of some of the larger ones can still be seen across Europe today.
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c. 23 CEThe castra praetoria, permanent camp of the Praetorian Guard, is built in Rome by Sejanus.