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