Bone is an important mineral source for the entire organism especially for Ca, P, Na and trace elements like Sr, Mg, Zn and
it is the reservoir for the storage and mobilization of many important ions required for the metabolic activity of the organism.
The concentration of these elements are influenced by the individual diet and the content of some trace elements can be utilized
as indicators of the diet of ancient populations. Bones from three differents archaeological sites found in Lombardy, Northern
Italy, were investigated: (A) Roman necropolis found in Milan active from the 1st century B.C. to the 2nd century A.D; (B)
Burial of the Longobard family found in Campione d'Italia (North of Lombardy) active between the 7th and 9th century A.D.;
(C) Medieval necropolis of a Longobard community, found in a village near Cremona (SE of Lombardy) active in the 7th century
A.D. Structures of bones and their trace element content seem to put in evidence on some differences in the way of life of
the three investigated groups.