The application of pollen analyses in the study of burials and related textiles: the studied cases of King Peter the Grat's mediaval grave and the prehistoric cave of Cova des Pas (Spain) Y.Llergo, S.Riera, G.Servera, Y.Miras, C.Subiranas, J.E.Garcia-Biosca, M. Miquel, LL.Picornell, M.Cabanis