Event Comment: The King's Company.  
The date of 
the first performance is not known.  
Wilson (
Six Restoration Play-Dates, pp. 222-23) argues from a number of references (principally in 
the Epilogue) to events of early 1681 which point to a premiere near May 1681: to 
the dissolution of 
Parliament, 28 March 1681; to 
the comet which appeared in November 1680 and disappeared in January 1680@1; to 
the Hatfield Maid; to 
William Lilly, 
the astrologer, who is referred to as though alive, thus suggesting a premiere before his death, 9 June 1681.  It is possible that 
the premiere may have been earlier than this.  In 1681 was published 
Poeta de Tristibus; or, The Poet's Complaint, whose author had obviously read 
the Prologue and 
Epilogue to 
The Unhappy Favourite.  He represents himself as a disappointed dramatist whose tragedy has been rejected by both houses because "
their Summer-store@Will all this Winter last."  With 
the work entered in 
the Term Catalogues in 1682 and a copy purchased by 
Narcissus Luttrell with his note "4d 1681 12 Nov" (see 
A Bibliography of John Dryden, ed. 
Macdonald, pp. 235-36), his quotations from 
the Epilogue to 
The Unhappy Favourite and references to 
the Prologue would offer no difficulties if it were not that 
the "Author's Epistle" in which 
the references are made is dated "at 
Dover the Tenth day of January 1680@1," thus suggesting that he had seen 
the Prologue and Epilogue before that date.  Never
theless, some of 
the references in 
the Epilogue (to 
Heraclitus Ridens, beginning on 1 Feb. 1680@1, and 
Democritus Ridens, beginning on 14 March 1680@1) preclude a January premiere for 
the Prologue and Epilogue.  Possibly 
the dating of 
the "Author's Epistle" is in error