Introducing Shakespeare: A Graphic Guide - Nick Groom, Piero 2013
The three parts of Henry VI must have been written sometime before 1592. They stemmed from an original two-part play by Shakespeare: The First Part of the Contention betwixt the Two Famous Houses of York and Lancaster (published in 1594) and The True Tragedy of Richard Duke of York (1595). These became the second and third parts of what we now call Henry VI, and Part One was added later to complete the reign.
UNDER THE TITLE HARRY THE SIXTH IT PROVED A RUNAWAY SUCCESS AT PHILIP HENSLOWE’S ROSE THEATRE.
THEN THE PLAGUE WAS BACK AND THE THEATRES CLOSED.