The Carlist Party of Euskalherria was historically part of the wing that was represented by which head of the House of Bourbon-Parma?
Carlist Party of Euskalherria:  The party was historically part of the pro-Carlos Hugo wing of the carlist movement. Carlos Hugo, Duke of Parma: Carlos Hugo, Duke of Parma and Piacenza (8 April 1930 – 18 August 2010) was the head of the House of Bourbon-Parma from 1977 until his death.
Carlos Hugo, Duke of Parma