The red grape variety (breeding no. Klosterneuburg 1358-1-47) is an interspecific new variety between Zweigelt x Klosterneuburg 1189-9-77 (Seyve-Villard 18-402 x Blaufränkisch). It contains genes from Vitis berlandieri, Vitis cinerea, Vitis lincecumii, Vitis rupestris and Vitis vinifera. The hybrid was crossed in 1970 by Dr Gertraud Mayer at the Klosterneuburger Weinbauinstitut (Langenzersdorf) in Lower Austria.

The former director of the institute, Leonhard Roesler (1839-1910), was honoured with the name. It was authorised as a quality wine grape variety in Austria in 2000. A similar variety also created here is the new variety Rathay.
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