Specific periods, eras, historical events, etc.: these should all be capitalized as proper nouns. ... However, centuries—and the numbers before them—are not capitalized. See the examples below for an illustration of this rule: In the fifteenth and sixteenth centuries , England blossomed into an empire.

Should numbers be capitalized?

A simple rule for using numbers in writing is that small numbers ranging from one to ten (or one to nine, depending on the style guide) should generally be spelled out. Larger numbers (i.e., above ten) are written as numerals.

Should this word be capitalized?

In general, you should capitalize the first word, all nouns, all verbs (even short ones, like is), all adjectives, and all proper nouns. That means you should lowercase articles, conjunctions, and prepositions—however, some style guides say to capitalize conjunctions and prepositions that are longer than five letters.