A prologue, sometimes referred to as a preface, is an introduction at the beginning of a literary work. This type of introduction generally gives information to the reader or audience, assisting in the ability to understand what is to follow in the main body of the work. A prologue may introduce the setting, preview the characters, or establish a theme or moral for the work. Examples of this can be found in Greek and Elizabethan drama. In a play, a prologue often takes the form of a character’s monologue or dialogue.

In Greek tragedy, the prologue is the opening section of a drama that precedes the first choral ode. In the play Oedipus Rex by Sophocles, the prologue is presented as dialogue between Oedipus, the Priests, and Kreon, and establishes that the plague in Thebes will end as soon as Laios’s murderer is found. This precedes the opening hymn of the Chorus that appeals to the gods.

Shakespeare includes a prologue to set up the story behind the star crossed lovers in Romeo and Juliet. In this case, the Chorus delivers the prologue which begins,

“Two households, both alike in dignity,
In fair Verona, where we lay our scene,
From ancient grudge break to new mutiny,
Where civil blood makes civil hands unclean.
From forth the fatal loins of these two foes
A pair of star-cross'd lovers take their life”

Not only does Shakespeare introduce the story line of two warring Verona households with his prologue, he foreshadows the ending of the play and alerts the audience to the tragedy about to unfold.

While many may consider a prologue a literary device used only in plays, it is also often seen in prose works. For example, in Plain and Simple, Sue Bender uses a prologue to set the stage for her experiences with the Amish when she says, “I had an obsession with the Amish. Plain and simple. Objectively it made no sense. I, who worked hard at being special, fell in love with a people who valued being ordinary.” In fact, prologues in literary prose can be traced as far back as Chaucer’s The Canterbury Tales which includes prologues that provide background information and character sketches for the tales.

Prologues may be written by the author of the work, or may be contributed by another writer who uses this introduction as a way of presenting and recommending a literary work.