Event Comment: The Duke's Company. The date of the first production is not known, but the entry of this play in the Term Catalogues for November 1680 suggests a first offering in September or October 1680. The music for the play was composed by Henry Purcell, his first (according to Downes composing for the stage. Downes (Roscius Anglicanus, p. 38) gives a shortened cast and adds: All the Parts in't being perfectly perform'd, with several Entertainments of Singing; Compos'd by the Famous Master Mr Henry Purcell, (being the first he e'er Compos'd for the Stage) made it a living and Gainful Play to the Company: The Court; especially the Ladies, by their daily charming presence, gave it great Encouragement. Dedication, Edition of 1680: The Reputation that this Play received on the Stage, some few Errors excepted, was more than I could well hope from so Censorious an Age....You [the Duchess of Richmond] brought her Royal Highness just at the exigent Time, whose single Presence on the Poet's day is a Subsistence for him all the Years after. A song, Hail to the myrtle shade, is in Choice Ayres and Songs, The Third Book (dated 2 Nov. 1680)

Event Comment: The King's Company. The date of the first performance is not known, but its listing in the Term Catalogues, November 1681, suggests late October as a likely latest date for its premiere. If Mithridates was acted in mid-October at the opening of Drury Lane, Sir Barnaby Whigg may well be the first new play offered by the King's Company in the autumn. A Song in Act I, Blow Boreas Blow, with music apparently by Henry Purcell, is in A Third Collection of New Songs...Words by Mr D'Urfey, 1685, and in Dramatic Works of Henry Purcell, Purcell Society, III (1917), xiv-xv