Demeter's Spring in Patras, known today as Saint Andrew's Well, is one of the city's most fascinating historical and religious landmarks. In antiquity, this site was a sacred place of worship dedicated to Demeter, the ancient Greek goddess of agriculture and fertility. According to the ancient traveler Pausanias, a famous oracle operated next to the spring, where people would lower a mirror into the water to divine whether a sick relative would recover or perish.
With the advent of Christianity, the site became profoundly linked to Saint Andrew, the patron saint of Patras. According to religious tradition, the Apostle Andrew used to preach at this very spot and utilized the spring's water to baptize the city's earliest Christians, eventually facing martyrdom nearby. Consequently, the ancient pagan sanctuary evolved into a major Christian pilgrimage site, and the spring water was revered as holy water (agiasma).
Today, the historic spring is preserved in the underground crypt of the Old Church of Saint Andrew (built in the 19th century), right next to the monumental New Basilica. Visitors and pilgrims can walk down into the beautifully maintained subterranean chamber where the fresh water still flows, standing as a living monument that bridges ancient Greek heritage with the deeply rooted Christian history of Patras.