The above appraisal is from a recent edition of the U.S. version of Antiques Roadshow, and features a manuscript sonnet by Oscar Wilde which has recently come to light.
While it is a newly discovered manuscript, it is not a newly discovered poem. It is one from the Wilde canon which he retitled as Ideal Love andpresented with a dedication to an acquaintance named Christian Gauss, a young American journalist.
The sin was mine; I did not understand. So now is music prisoned in her cave, Save where some ebbing desultory wave Frets with its restless whirls this meagre strand. And in the withered hollow of this land Hath Summer dug herself so deep a grave, That hardly can the silver willow crave One little blossom from keen Winter’s hand.
But who is this who cometh by the shore? (Nay, love, look up and wonder!) Who is this Who cometh in dyed garments from the South? It is thy new-found Lord, and he shall kiss The yet unravished roses of thy mouth, And I shall weep and worship, as before. 
For scholarly analyses of Oscar Wilde’s life and work subscribe to The Wildean, the journal the Oscar Wilde Society.
Personal testimony in chronicles and memoirs has forever been the basis of recorded history. Like the legal status of eye-witness testimony, accounts created during living memory have an immediacy that often frees them of taint or nuance. Not all of it is reliable, of course, so researchers should evaluate the source, the subject, and the period before the facts. And we shall get to that.
But first we need to address the inadmissible, principally the hearsay of second-hand material which is often less well defined, and less reliable. Take Columbus, for instance. And before you think this a characteristic segue into Ellmann getting the date wrong for Oscar Wilde’s lecture in Columbus, Ohio, it isn’t—although he did. I mean that yesterday was Columbus Day here in the United States, and on the subject of unreliability I am reminded of Washington Irving‘s supposed history of Christopher Columbus’ first visit to the Americas. For it was Irving who popularized the myth that Columbus set sail thinking he would fall off the edge of the world, when, in reality, the intrepid Italian knew all along about the earth’s curvature—he just miscalculated the circumference. Read Darin Hayton’s salutary article on Irving’s fabrication.
Almost as damaging as intentionally false history is unintentionally false biography. Because all too often new biography is simply an echo chamber of old biography, in which successive viewpoints grow increasingly redundant and incoherent.
Such historiography may have been acceptable, or at least accepted, in the days when collective knowledge was indistinguishable from reflective guesswork. But in an age of digital access to archival newspapers, journals, records, and books, there is no longer any excuse for apocryphal scholarship, and nowhere is this discipline more acutely needed than in the study of Oscar Wilde.