CDXXIV
CDXXIV is a Roman numeral representing the number 424. It is composed of CD (400) plus XX (20) plus IV (4): 400 + 20 + 4 equals 424. The CD portion uses subtractive notation, where C before D indicates 400 (500 minus 100), and IV uses subtractive notation to make 4, while XX contributes 20 additively.
In usage, CDXXIV can appear in dating historical events, numbering items, or labeling sections in documents
If used to denote a year, 424 CE falls in the mid-5th century, within the broader period