The Roman numeral "MCDLXX" represents the number 1470. In this numeral, "M" stands for 1000, "CD" represents 400 (500 minus 100), "L" is 50, and "XX" equals 20. When you add these values together, you get 1000 + 400 + 50 + 20, which totals 1470. Roman numerals are a numeral system originating from ancient Rome. They use combinations of letters from the Latin alphabet, specifically I, V, X, L, C, D, and M, to signify values. This system was widely used throughout the Roman Empire and is still seen today in various contexts, such as clock faces and book chapters.