The term
Henriad, following after Kernan, acquired an expanded second meaning, which refers to two groups of Shakespearean plays: the tetralogy mentioned above (
Richard II; Henry IV, Part 1; Henry IV, Part 2; and
Henry V), and also four plays that were written earlier and are based on the historic events and civil wars now known as
The Wars of the Roses;
Henry VI, Part 1, Henry VI, Part 2, Henry VI, Part 3, and
Richard III. In this sense, the eight Henry plays are known as the Henriad, and when divided in two, the group written earlier may be known as the "first Henriad" with the group that was written later known as the "second Henriad". The two Shakespearean tetralogies share the name Henriad, but only the "second Henriad" has the epic qualities that Kernan had in mind in his use of the term. In this way the two definitions are somewhat contradictory and overlapping. Which meaning is intended can usually be derived by the context. The eight plays, when considered together, are said to tell a unified story of a significant arc of British history from
Richard II to
Richard III. These plays cover this history, while going beyond the English chronicle play; they include some of Shakespeare's greatest writing. They are not tragedies, but as history plays they are comparable in terms of dramatic or literary quality and meaning. When considered as a group they contain a narrative pattern: disaster, followed by chaos and a battle of contending forces, followed by the happy ending—the restitution of order. This pattern is repeated in every play, as Britain leaves the medieval world and moves towards the British Renaissance. These plays further express the "Elizabethan world order", or mankind's striving in a world of unity battling chaos, based on the Elizabethan era's philosophies, sense of history, and religion. The eight-play Henriad is also known as The First Tetralogy and The Second Tetralogy; a terminology that had been in use, but was made popular by the influential Shakespearean scholar
E.M.W. Tillyard in his 1944 book,
Shakespeare’s History Plays. The word "tetralogy" is derived from the performance tradition of the
Dionysian Festival of ancient Athens, in which a poet was to compose a tetralogy (τετραλογία): three tragedies and one comedic satyr play. Tillyard studied these Shakespearean history plays as combined in a dramatic serial form, and analyzed how, when combined, the stories, characters, historic chronology, and themes are linked and portrayed. After Tillyard's book, these plays have often been combined in performance, and it would be a very rare occurrence for
Henry VI, part 2 or
3, for example, to be performed individually. Tillyard considered each tetralogy linked, and that the characters themselves link the stories together when they tell their own history or explain their titles. The theories that consider the eight plays as a group dominated scholarship in the mid 20th century, when the idea was introduced, and have since engendered a great deal of discussion.
King John is not included in the Henriad because it is said to have a style that is of a different order than the other history plays.
King John has great qualities of poetry, freedom and imagination, and is appreciated as a new direction taken by the author.
Henry VIII is not included due to unresolved questions regarding how much of it is coauthored, and what of it is written by Shakespeare. ==Three-play Henriad==