A new crossing created at the Klosterneuburg oenology school nursery from the varieties Zweigelt x (Seyve-Villard 18-402 x Blaufränkisch), that is particularly resistant to fungal vine diseases. This double-crossing is named after Leonhard Roesler (1839 – 1919), who was also a director at the oenology school in Klosterneuburg. The variety is well suited to organic viticulture, and was classified as a quality variety in the year 2000. The wines display a deep, intensive colour, are rich in extract and have a characteristic spice. The variety is a popular blending partner.