Illustrated Companion to the Latin Dictionary/Principia

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

PRINCIP'IA (plural of principium). The head-quarters in a Roman camp; comprising that portion of it where the tents of the general officers were situated, and the space in front of them where the legionary standards were erected, harangues addressed to the soldiery, justice administered and the sacrifice performed. Liv. vii. 12. Id. xxviii. 24. Tac. Hist. iii. 13. and woodcut s. CASTRA.