Calcata Vecchia stands on a mountain of tufa rock from which it dominates the valley of the river Treja. According to legends in Calcata, in 1527 was captured a lanzichenecco who had taken part in the Sack of Rome, and plundered the Holy of Holies of San Giovanni in Laterano. Imprisoned in the country, would have hidden the reliquary containing the Holy foreskin in his cell, where it would have been discovered in 1557. Since then the church began to venerate the relic, granting to the pilgrims an indulgence of ten years.