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Wikipedia: The Latin word castra, with its singular castrum, was used by the ancient Romans to mean buildings or plots of land reserved to or constructed for use as a military defensive position. As the word appears in both Oscan and Umbrian as well as in Latin, it probably descended from Indo-European to Italic. In classical Latin the word castra always means great legionary encampment, both marching, temporary ones and the fortified permanent ones, while the diminutive form castellum was used for the smaller forts, which were usually, but not always, occupied by the auxiliary units and used as logistic bases for the legions, as explained by Vegetius.
![[Porta Praetoria, the gate of ancient Roman castra at Porolissum.]](http://images.ookaboo.com/photo/s/Gate_Porolissum_s.jpg "Porta Praetoria, the gate of ancient Roman castra at Porolissum.")
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![[The reconstructed porta praetoria of the castle Pfünz, Germany, near the Raetian Limes]](http://images.ookaboo.com/photo/s/Porta_Praetoria_Kastell_Pf_C3_BCnz_s.jpg "The reconstructed porta praetoria of the castle Pfünz, Germany, near the Raetian Limes")
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 from Emi Cristea |
 from Mediatus |
![[Reconstruction of the specula'' or ''vigilarium'' , "watchtower", a type of ''castrum, of Fectio]](http://images.ookaboo.com/photo/s/Wp12_77_Rekonstruktion_s.jpg "Reconstruction of the specula'' or ''vigilarium'' , \"watchtower\", a type of ''castrum, of Fectio")
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![[Reconstructed east gate of a Castra Stativa, a more permanent base.]](http://images.ookaboo.com/photo/s/Ostkastell_Welzheim_s.jpg "Reconstructed east gate of a Castra Stativa, a more permanent base.")
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from Haselburg-müller |
from Mediatus |
![[A sanitary channel at Potaissa]](http://images.ookaboo.com/photo/s/2006_0602TurdaPotaissa0122_s.jpg "A sanitary channel at Potaissa")
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from CristianChirita |
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