It's an intersection of wine grapes produced in Germany in 1975 at the Research Institute of Freiburg. This variety is very interesting for the high quality of the wines produced and disease resistance. It has many similarities with Chardonnay.
Cabernet Sauvignon - Wikipedia
Piwi wines
PIWIs: the most promising varieties
The three disease resistant Bouquet varieties selected for grape juice
Bordeaux beware, here comes the Kent claret
Bronner - Rebschule Freytag
Piwi grape varieties - the future of viticulture?
Bronner (grape) - Wikipedia
BRONNER, RESISTANT VARIETY, WINE GRAPE
Grape Varieties