MCDXXXIV

MCDXXXIV is a Roman numeral representing the integer 1434. It is composed of the symbols M, CD, XXX, and IV, in that order: M = 1000, CD = 400, XXX = 30, IV = 4.

Roman numerals use additive and subtractive principles. In MCDXXXIV, the subtractive pairs CD and IV denote 400 and 4 respectively; when a smaller value precedes a larger value, it is subtracted from the larger one, while other numerals are added from left to right.

The canonical modern form is MCDXXXIV. Non-subtractive variants include MCCCCXXXIV, where 400 is written as four Cs; such forms appear in older manuscripts or decorative uses, though they are less common in contemporary usage.

In historical contexts, MCDXXXIV denotes the year 1434 CE and may appear on inscriptions, manuscripts, or clocks from that period. The numeral is used wherever Roman numerals are preferred for dating or stylistic reasons, including scholarly works, architecture, and some legal or ceremonial documents.

See also: Roman numerals, Subtractive notation.