Usage Note
IX is the Roman numeral for nine, used in Spanish for chapter numbers, monarchs' names (Luis IX), and century references (siglo IX). It is read aloud as nueve (cardinal) or noveno/novena (ordinal). The subtraction principle of Roman numerals (IX = 10 minus 1) is relevant to literacy in historical Spanish texts where such numerals appear frequently.
Examples
"El siglo IX fue la época de los vikingos."
Natural Translation
The ninth century was the age of the Vikings.

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