Roman numerals

The system of conveying numerical information, generally employed throughout antiquity and the Middle Ages, in which quantities are represented as Roman letters ...

The system of conveying numerical information, generally employed throughout antiquity and the Middle Ages, in which quantities are represented as Roman letters: I or i (1), V or v (5), X or x (10), L or l (50), C or c (100), D or d (500), M or m (1000). There were local variations, which included the use of other letters.

    Michelle Brown, Understanding Illuminated Manuscripts (Malibu, CA: J. Paul Getty Museum in association with the British Library, c1994).