MCDXI

MCDXI is a Roman numeral representing the number 1411. In standard Roman numeral notation, it is composed of M (1000) followed by CD (400), then XI (11). The string MCDXI therefore encodes 1000 + 400 + 10 + 1. The form uses subtractive notation for the 400 part, with CD indicating 500 minus 100, and additive notation for the final 11.

In practice, 1411 can be expressed in various ways, but the canonical form is MCDXI. For related values one can construct surrounding numbers: 1400 is MCD, 1410 is MCDX, 1412 is MCDXII, and so on. The subtractive rule avoids writing DCCCC or CCCC for 400, and similarly avoids more than three consecutive repeats of I, X, C, or M.

Historically, MCDXI may appear in inscriptions or dated texts to denote the year 1411 CE. In modern usage, Roman numerals like MCDXI are most often seen on clock faces, monuments, chapter headings, or in decorative contexts where a classical or archaic appearance is desired. See also Roman numerals, numeral systems, and historical dating practices.