The devotion to Saint Agnes deeply touched Constantina, daughter of Emperor Constantine, who dedicated a grand basilica to her along the Via Nomentana in the 4th century. She also built her own circular mausoleum, decorated with imperial mosaics depicting Christ handing the keys of the Kingdom to Saint Peter, with Saint Paul by his side. Here lie the relics of young Agnes, whose Latin name means “lamb”, symbol of purity and of Christ himself. Every year, the Church continues a unique tradition: the blessing of lambs, whose wool is used to weave the pallium worn by the Pope and archbishops. Discover the history of this basilica, its early Christian mosaics, and the living tradition that unites Saint Agnes with the Good Shepherd.