CCCXXIV

CCCXXIV is the Roman numeral representing the number 324. It is formed from CCC (300) plus XX (20) plus IV (4). In Roman numeral notation, numerals of this form are used for dating events, identifying volumes or chapters, and other enumerations.

Historically, the year 324 CE is noted for Constantine the Great's defeat of Licinius at the Battle of Chrysopolis, which left Constantine as sole ruler of the Roman Empire. In the following years he moved toward establishing a new eastern capital, at Byzantium, which would be renamed Constantinople in the 330s.

In modern usage, CCCXXIV may appear in lists, catalog numbers, serials, page numbers, or model identifiers. It is not an especially common year today, but the form remains a standard way to render 324 in contexts that require Roman numerals.

Numerically, 324 is a composite, square number: 324 = 18 × 18, and also 2^2 × 3^4. It is divisible by 9 and by 4, and it has a range of divisors derived from its prime factorization.