CCCLXXX

CCCLXXX is the Roman numeral for the integer 380. It is formed by adding CCC (300) + L (50) + XXX (30), for a total of 380. This numeral uses additive notation, and does not employ a subtractive pair such as IV or XL in its standard form, making CCCLXXX the common rendering.

In historical contexts, the year 380 CE is notable for the Edict of Thessalonica issued by Emperor Theodosius I, which established Nicene Christianity as the state church of the Roman Empire and condemned other belief systems such as Arianism.

As a number, 380 is even and composite (2^2 × 5 × 19). In modern notation, CCCLXXX appears on inscriptions, clocks, catalogs, or lists that retain Roman numerals for dates, chapters, or enumerations. It remains part of the standard Roman numeral system used in scholarly editions and symbolic references.