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An eponym is a person, place, or thing for whom or for which something is named, or believed to be named. For example, Elizabeth I of England is the eponym of the Elizabethan era.

The adjectives derived from eponym, which include eponymous and eponymic, similarly refer to being the person or thing after whom something is named, as "the eponymous founder of the Ford Motor Company" refers to Henry Ford. Recent usage, especially in the recorded-music industry, also allows eponymous to mean "named after its central character or creator".

Periods have often been named after a ruler or other influential figure:

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Specific types of incidents

For examples, see the comparison table below.

By person's name

By category

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