
Tetralogy
Literary Origin
Originally used in ancient Greek literature for a set of four works.

The original tetralogy included three tragedies and a satyr play.
Cultural Works
Common in literature and arts, signifying a complete series.

J.R.R. Tolkien's Middle-earth books are not a tetralogy.
Unified Themes
The works in a tetralogy are often connected by themes or characters.

The Neapolitan Novels by Elena Ferrante form a compelling tetralogy.
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CycleQuartetSeriesSet
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