Which grape variety is a cross between Riesling and Madeleine Royal?

The cross between Riesling and Madeleine Royal is known as Müller-Thurgau, also referred to as Rivaner. This grape variety was created in the 19th century by Hermann Müller in Switzerland. It was specifically bred to combine the quality of Riesling with the early ripening characteristics of Madeleine Royal, making it a practical choice for cooler climates where harvest time can be critical.

Müller-Thurgau is widely planted in Germany and is known for producing aromatic white wines that can vary from light and fruity to more complex styles. Its characteristics often include floral notes, apple or pear flavors, and a refreshing acidity, although it doesn't typically attain the same depth and complexity as Riesling. The grape's ability to ripen earlier than Riesling adds to its popularity in certain regions.

In contrast, Weissburgunder, Pinot Gris, and Grauburgunder each have different origins or are separate varieties altogether, not resulting from the crossing of Riesling and Madeleine Royal.