CCLXXXIMLIX

CCLXXXIMLIX is a designation that appears in specialized archival cataloging systems used by the Roman Historical Society. The string is composed of two main segments. The first segment, CCLXXX, follows standard Roman numeral conventions and represents the number 280. The second segment, IMLIX, is a non‑standard construction that can be interpreted as a composite of I (1), M (1000), L (50), and IX (9). When read in this way, IMLIX corresponds to the numerical value 1,059. The concatenation of the two segments results in a compound identifier that can be read as “280‑1059”.

In practice, the designation CCLXXXIMLIX is used to label the 280th item in a collection that was dated or recorded in the year 1059. This dual‑numbering scheme allows archivists to reference both the ordinal position within a series and the chronological context in a single alphanumeric token. The Roman Historical Society adopted this system in the early 20th century after an extensive review of medieval cataloging practices, noting that many medieval manuscripts used both Roman and Arabic numerals in parallel inscriptions.

The use of CCLXXXIMLIX is documented in several handbooks on manuscript indexing, including the Society’s “Manual of Cataloging Numbers” (Vol. 2, 1934) and the 1951 revision by Dr. V. Aurelius. While the construction is not formalized in contemporary Roman numeral theory, it remains a useful tool in the niche field of medieval manuscript studies.

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