In Shakespearean scholarship, the Henriad refers to a group of William Shakespeare's history plays depicting the rise of the English kings. It is sometimes used to refer to a group of four plays (a tetralogy), but some sources and scholars use the term to refer to eight plays. In the 19th century, Algernon Charles Swinburne used the term to refer to three plays, but that use is not current.
In one sense, the Henriad refers to: Richard II; Henry IV, Part 1; Henry IV, Part 2; and Henry V – with the implication that these four plays are Shakespeare's epic, and that Prince Hal, who later becomes Henry V, is the epic hero. (This group may also be referred to as the "second tetralogy" or "second Henriad".)