Santoyo is a municipality located in the province of Palencia, Castile and León, Spain. The lands within the borders of the current municipality …Santoyo is a municipality located in the province of Palencia, Castile and León, Spain. The lands within the borders of the current municipality of Santoyo were populated since, at least, classical antiquity. In the Sarnallano moor some material remains of a vaccaean fort can be found. The "Las Quintanas" Roman villa was built in the Late_Roman_Empire, probably in the 4th century - in the 1990s archaeologists discovered amongst its ruins an oven, a hypocaustum, some pottery and a well full of debris.