CDLXV is a Roman numeral that represents the number 465. Roman numerals are a numeral system originating from ancient Rome, using combinations of letters from the Latin alphabet. In this case, "CD" stands for 400, "L" represents 50, and "XV" equals 15, which together sum up to 465. This numeral can be found in various historical contexts, such as in the dating of events or the numbering of chapters in ancient texts. Understanding Roman numerals, including CDLXV, is useful for interpreting historical documents, clocks, and certain modern applications like movie titles or book editions.