After a not verifiable but unlikely hypothesis was from a grape Refosco (Refoshin, Refošk, Rifòsc, Rifosco) or an ancestor of the already from Pliny the Elder (23-79) mentioned antique red wine Pucinum vinified. The first recorded mention of a grape variety named Refosco took place on June 6, 1409. In a document from a banquet in honor of Pope Gregory XII. (1335-1417) with the following served wines: Marzemino from Gradiscutta, Ramandolo from Torlano, Ribolla from Rosazzo, verduzzo from Faedis and Refosco from Albana. Varieties under the name Refosco were subsequently in northern Italy (especially Friuli ) and Slovenia mentioned, but the identity is uncertain. This is understood as a group of closely related red grape varieties; but there is also at least one white:
The two varieties Refosco di Rauscedo and Tazzelenghe (Refosco del Botton) have one Parent-offspring relationship to the variety Refosco di Faedis. Refosco varieties are mainly in the Italian regions Friuli-Venezia Giulia. Veneto and Emilia-Romagna, as well as in Slovenia cultured. In California, the variety was / are mistaken Mondeuse Noire referred to as Refosco.
Source: Wine Grapes / J. Robinson, J. Harding, J. Vouillamoz / Penguin Books Ltd. 2012