jan 1, 17000 BC - Altamira was the first European cave for which prehistoric origin of the paintings was suggested and promoted by Marcelino Sanz de Sautuola.
He published his research with the support of Juan Vilanova y Piera in 1880 to public acclaim. Nonetheless a bitter public controversy among
experts ensued and continued until 1902, as reports of similar findings of prehistoric paintings in the region had accumulated and
evidence could no longer be rejected.