The Picos de Europa National Park was the first one to be awarded that designation in Spain. Its history goes back to 1918, when don Pedro Pidal, Marquis of Villaviciosa, promoted the law to create the Montaña de Covadonga National Park, which was named Picos de Europa National Park on 30 May 1995. This natural area was awarded the UNESCO Biosphere Reserve designation in 2002.
http://www.spain.info/en_IN/que-quieres/naturaleza/espacios-naturales/parque_nacional_de_los_picos_de_europa.html