Among the most important finds in the pre-Roman Marche, the »Circolo delle Fibule« of Sirolo-Numana (prov. Ancona) stands out for the huge number of fibulae found within its nine tombs – over 1,200 specimens of different types and materials. Discovered in 1970 and never before published, this key context of Picene archaeology is now the subject of a specific study that illustrates the variety of the grave assemblages and the complexity of the local funerary customs. An examination of the grave goods gives an insight into the processes of social structuring taking place in Numana between the end of the 7th century B.C. and the beginning of the 5th century B.C., between a strong conservatism and the first international contacts.