The red grape variety comes from Spain, Synonyms are Castañal, Mourisco and Rabo de Cordeiro. It was widespread and very popular until the beginning of the 20th century. According to in 2009 DNA analysis there is one Parent-offspring relationship to the variety Amaral (Caíño Bravo). The vine, which is almost extinct today, is grown in very small quantities on the Spanish-Portuguese border on the Spanish side of the Miño River. In 2010, however, no stock was shown (Kym Anderson ).
Source: Wine Grapes / J. Robinson, J. Harding, J. Vouillamoz / Penguin Books Ltd. 2012