Henriad

A group of four of Shakespeare’s plays: Richard II; Henry IV, Part 1; Henry IV, Part 2; and Henry V, with the implication that these four plays are Shakespeare’s epic poem.

Either of two groups of four each of Shakespeare’s plays: The "first Henriad" (Henry VI, part 1, Henry VI, part 2, Henry VI, part 3, and Richard III), and the "second Henriad" (Richard II; Henry IV, Part 1; Henry IV, Part 2; and Henry V).https://www.thegreatcoursesdaily.com/richard-ii-shakespeare-questions-divine-right-of-kings/

The title translated into English of an epic poem, Le Henriade, by Voltaire.