Illustrated Companion to the Latin Dictionary/Librarii

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. 

LIBRA'RII. A class of educated slaves who were employed by their masters in different occupations requiring a certain amount of literary acquirements and skill; such as transcribing and binding books, making extracts, writing letters, acting as librarians. Hence they were distinguished by an epithet denoting the particular service which each had to perform; as scriptor librarius, the transcriber or copyiist; a studiis, who made extracts, or performed the duties of secretary and co-adjutor in the studies or business of his employer; ab epistolis, who conducted his master's correspondence in the character of an amanuensis. Hor. A. P. 354. Cic. Agr. ii. 5. Att. iv. 4. Suet. Claud. 28. Cic. Fam. xvi. 21. Orelli, Inscript. 2437.

2. Same as BIBLIOPOLA. Sen. Ben. vii. 6.