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Thus, from the oldest to the youngest, all archaeological sites are likely to be dated by an appropriate method.Dating material drawn from the archaeological record can be made by a direct study of an artifact, or may be deduced by association with materials found in the context the item is drawn from or inferred by its point of discovery in the sequence relative to datable contexts.
Thus, 1587 is the post quem dating of Shakespeare's play Henry V.
That means that the play was without fail written after (in Latin, post) 1587.
But this method is also useful in many other disciplines.
Historians, for example, know that Shakespeare's play Henry V was not written before 1587 because Shakespeare's primary source for writing his play was the second edition of Raphael Holinshed's Chronicles, not published until 1587.
Suppose you find a fossil at one place that cannot be dated using absolute methods.