In France, Trebbiano is mainly referred to as Ugni Blanc. However, in the Cognac region (where it is 1 of 3 grapes used to produce Cognac & Armagnac) Ugni Blanc is referred to as “Saint Emilion”- like the subregion of Bordeaux. This is extremely confusing, as St. Emilion wines are typically a red blend of Cabernet Sauvignon, Cabernet Franc, and Merlot  (ratios vary).

So:

Trebbiano (Italy) =  Ugni Blanc (France) = “Saint Emilion” (Cognac)

“Saint Emilion” (white grape, Cognac) >=< St. Emilion (red grape blend, Bordeaux)

http://blog.cognac-expert.com/different-cognac-grapes-ugni-blanc-folle-blanche-colombard/