"The "bull's blood of the Carpathians" comes from the Tokay, where it was the main variety of red wine production there. No later than 1000 BC. this rarity was sent to the Main and the Rhine by German settlers from the Ofner Mountains, Tokay or Transylvania . Until it was rediscovered in 2010, it was considered extinct." (https://historische-rebsorten.de/rebsorte/schlehentraube/)