Editors of Shakespeare's Complete Works must decide what to include. Although not in the First Folio collection of 1623, The Two Noble Kinsmen and Edward III have now entered the canon as plays co-authored by Shakespeare. Determining the Shakespeare Canon makes the case for lifting Arden of Faversham, first published in 1592, over the same threshold. A wealth of evidence indicates that Shakespeare was wholly or largely responsible for several of its central scenes (constituting Act III in editions divided into acts), and that the domestic tragedy can thus be added to the mounting list of his dramatic collaborations. Shakespeare's beginnings as a playwright are due for reconsideration.