(Rentería, Guipúzcoa, España, 1915 - San Sebastián, Guipúzcoa, España, 1987)
"Koldo Mitxelena Elissalt, también conocido como Luis Michelena o Koldobika Mitxelena (Rentería, 20 de agosto de 1915 - San Sebastián, 11 de octubre de 1987), fue un destacado lingüista español de origen vasco. Es una de las máximas autoridades en los estudios sobre la lengua vasca y fue uno de los artífices de la unificación de este idioma."
"Koldo Mitxelena Elissalt (Basque pronunciation: [koldo mitʃelena]) (also known as Luis Michelena; 1915, Errenteria, Gipuzkoa - 11 October 1987, San Sebastián) was an eminent Basque linguist. He taught in the Department of Philology at the University of the Basque Country, and was a member of the Royal Academy of the Basque Language. He is described as "the greatest scholar the Basque language has ever seen." He is known for the complete reconstruction of Proto-Basque he undertook in the 1950s, as well as the formal demonstration in 1954 that the Aquitanian language was an ancestral form of Basque. Mitxelena was also one of the main participants in the creation of "Euskara Batua" or Unified Basque. In 1987 he was declared Seme Kuttun of the City of Errenteria, literally 'beloved son'."