The collection of severed heads was a unique funerary practice within the ancient Iberian world, notably in the Iron Age between 2,000 and 3,000 years ago. The study of these heads and their treatment offers an exceptional opportunity to analyze these communities, of which limited archaeological record exists, since cremation was the predominant burial ritual. This practice consisted of the public exhibition of the skulls of certain individuals subjected to a post-mortem treatment, which involved the hammering in or insertion of a long metal nail. Some of these decapitated skulls have been recovered with signs of nailing, and in some cases with an iron nail still in place. Isotope analysis of heads recovered from the Puig Castellar and Ullastret sites
