Wikipedia
In the Roman Empire, the Latin word castrum (plural castra) was a building, or plot of land, used as a fortified military camp.
Castrum was the term used for different sizes of camps including a large legionary fortress, smaller auxiliary forts, temporary encampments and "marching" forts. The diminutive form castellum was used for fortlets, typically occupied by a detachment of a cohort or a century.
In English, the terms "Roman fortress", "Roman fort" and "Roman camp" are commonly used for castrum. However, scholastic convention tends toward the use of the word "camp", "marching camp" and "fortress" as a translation of castrum.
Usage examples of "castra".
Our masters do not permit us barbarians to injure a citizen of Rome even though he may be from Castra Sanguinarius, except in self-defense or upon the battlefield in time of war.
Rome who live in Castrum Mare, of course, as one from Castra Sanguinarius well knows.
Yes, you must be a barbarian unless, as I suspect, you are not telling me the truth and you are indeed from Castra Sanguinarius.
Honus Hasta revolted and founded the city of Castrum Mare in the 953rd year of Rome, Castra Sanguinarius was overrun with criminals, so that no man dared go abroad at night without an armed body-guard, nor was any one safe within his own home, and Honus Hasta, who became the first Emperor of the East, swore that there should be no criminals in Castrum Mare and he made laws so drastic that no thief or murderer lived to propagate his kind.
It would not take much to convince the Emperor that this Erich von Harben is an emissary of Cassius Hasta, who is reputed to be in Castra Sanguinarius.
The shes of the city of Castra Sanguinarius meant no more to the savage ape-man than did the shes of the village of Nyuto, chief of the Bagegos.
During the ensuing five years the cohort settled several times in what they hoped would prove a permanent camp, but it was not until the 853rd year of Rome that, by accident, they discovered the hidden canyon where now stands Castra Sanguinarius.
I have heard mentioned so often and that is called Castra Sanguinarius?
Here, for over seventeen hundred years, the descendants of these families have lived in comparative peace and security, but in an almost constant state of war with Castra Sanguinarius.
Maximus Praeclarus led Tarzan of the Apes from the home of Dion Splendidus in the city of Castra Sanguinarius, the soldiers, gathered by the doorway, voiced their satisfaction in oaths and exclamations.
Dilecta, and it is also my wish, for thus would the two most powerful families of Castra Sanguinarius be united and the future of the empire assured.
Already there are many who would rise against Sublatus and the whites of Castra Sanguinarius.
There was Cassius Hasta of Castrum Mare, son of a Caesar, and Maximus Praeclarus, a patrician of Castra Sanguinarius and captain of Legionaries.
Praeclarus about Castra Sanguinarius and with Cassius Hasta about Castrum Mare.
This Erich von Harben has never been in Castra Sanguinarius, and my friend here is not himself a Sanguinarian: He is a white barbarian from the outer world, and if his story be true, and I have no reason to doubt it, he came here in search of this Erich von Harben.