Usage Note
XIII (tredicesimo) is the Roman numeral for 13th, used in Italian to denote centuries, monarchs, and numbered items. The 13th century is il Duecento in Italian historical convention (referring to the 1200s), not il tredicesimo secolo — learners should note this century-naming quirk. Written as 'XIII' in formal and historical texts.
Examples
"Il XIII secolo fu ricco di arte."
Natural Translation
The 13th century was rich in art.
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