@lifeattable I don't know about LATEST research, but is there any serious controversy? Jancis's "Wine Grapes" very specifically says it is from the Gironde, and introduced to Italy in the early 19th century. Also, Ian d'Agata does not give it an entry in his very comprehensive "Native Wine Grapes of Italy"
@lifeattable OK, you are quite correct. It would have been useful for Friulano to have an index entry!
If you have checked in those books, I have little more to add. You could try asking one of the authors of Wine Grapes perhaps? They can be quite responsive to questions like that, but it probably helps if you ask on their Purple Pages forum - sadly I am no longer a member.
@winenous Controversy, no, but lots of confusion IMO. In Jancis’ earlier “Vines, Grapes and Wines,” she lists it as from Italy, but later in “Wine Grapes” changes to Gironde w/o including much explanation.
D’agata does list it, under “Tocai Friulano,” which is still the official grape name in Italy. He considers references to Tokay #wine in FVG as early as 12th C., but admits it is unclear exactly which grape was used in those wines. The section ends w/o a clear conclusion.