Praefectus castrorum
Praefectus castrorum praefect of the camp, is first mentioned in the reign of Augustus. There was one to each legion. Hence there were often more than one in a camp. (Veil. Pat. 2.112; Tac. Ann. 1.20, 14.37.) We learn from Vegetius (2.10) that it was his duty to attend to all matters connected with the making of a camp, such as the vallum, fossa, &c., and also to the internal economy of it. He seems to have taken rank between the tribunes and the centurions. (Cf. Wilmanns in Eph. Epig. 1.81 ff.)
From William Smith (ed.), Dictionary of Greek and Roman Antiquities. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.