Should Prehistoric Be Capitalized?

Following the general rule set forth in The Chicago Manual of Style, “a descriptive designation of a [historical] period is usually lowercased, except for proper names.” While “prehistoric periods are capitalized..

Do you capitalize eras?

Specific periods, eras, historical events, etc.: these should all be capitalized as proper nouns. Why? Since there are many periods, eras, wars, etc., the capital will differentiate the specific from the common.

Should you capitalize ancient history?

No. We follow Merriam-Webster, which indicates that the terms ancient and classical are not capitalized when they are attached to names of languages or periods.