Txillardegi, Spanish linguist and politician (b. 1929)
José Luis Álvarez Enparantza (27 September 1929 – 14 January 2012), better known by his pseudonym Txillardegi, was a Spanish linguist, politician and writer. Born in San Sebastián (Basque Country, Spain), he did not learn Basque until the age of 17, but came to be considered one of the most influential figures in Basque nationalism and culture in the second half of the 20th century. He was one of the founders of ETA, but in 1967 he left because he did not agree with its political line.