This stone wine press is located in the vineyard of Peitieiros, near the hamlet of A Granxa—formerly a wine-producing estate belonging to the Count of Ribadavia, who maintained a residence and winery in this area. The monks of San Clodio and San Martiño Pinario also held estates in this village. Viticulture here dates back to ancient times; the remains of the Peitieiros wine press (dating from the 6th to the 12th centuries) indicate that wine has always been the primary crop.
In the Middle Ages, winegrowers who paid a portion of their harvest—known as a *peito*—to their lord were referred to as *peiteiros* or *peitieiros*. This is the origin of the place name, which, by extension, is also applied to this large stone wine press. When it was uncovered, the basin was found to have a pinkish hue, indicating its use in the production of red wine. Based on its dimensions, it is estimated that each pressing could yield between 2,000 and 3,000 liters of wine. Given the abundant traces of vineyards, wineries, vats, and wine presses, production in the area of Pazos Hermos must have been significant. It is estimated that, combining the output from local wineries with that of estates held by lay and ecclesiastical lords, some 200,000 liters of white and red wine were produced here in the 18th century.