MDCCCXX

MDCCCXX is a Roman numeral representing the number 1820. It is formed by M (1000) + D (500) + CCC (300) + XX (20). This notation is commonly used to denote years on inscriptions, monuments, clock faces, and in formal documents, and can appear in stylized dates in literature and media.

In historical context, the year 1820 saw the Missouri Compromise in the United States, which admitted Maine as a free state and Missouri as a slave state and established the line at 36 degrees 30 minutes north latitude for the future expansion of slavery in the western territories. The agreement aimed to preserve political balance in Congress between free and slave states.

Beyond dating, MDCCCXX may appear as part of a sequence, edition, or formal dating in architectural inscriptions or scholarly works that employ Roman numerals. The numeral is part of the broader system of Roman numerals used in classical literature and historical notation and serves as a conventional additive representation for the year 1820.