El Castillón, is an archaeological site located in the Spanish hamlet of Santa Eulalia de Tábara, in the Municipality of Moreruela de Tabara (province of Zamora, Region of Castilla y Leon, Spanish mainland) The site covers an area of about 4 Hs and it situated over a plateu at the top of a hill located on the right riverside of the River Esla (Tributary into the Duero). The site has been inhabited since the Iron Age, but the most known period of the site belongs to the Late Roman Era as a large number of late hispano-roman red gloss pottery testifies (TSHT). Early Modern period is clearly represented by pieces of grey and printed pottery type DSP. Hand made pottery is in a few number and it has been unearthed in limited areas and secondary depots, In spite of it, it clearly belongs to the 1st Iron Age. The site is enclosed by a U-shaped wall surrounding the settlement but the east where an abrupt cliffs falls to the river. It belongs, since 1985, to the Regional Government of Castilla y Leon Inventory of Protected Heritage in the category as Cave Painting Sample, because just below the site, in a shelter of the cliff falling to the river, schematic art samples where found in the site known as The shelter of El Castillon.

Excavations started in 2007, within the frame context of the PIDPAPZ project (Project on the Investigation and difusion of the Late Prehistory Archaeological Heritage of the Province of Zamora). The scientific team was led by the archaeologists Jose Carlos Sastre Blanco (University of Granada) and Oscar Rodriguez Monterrubio (UNED), just since the beginning the archaeologist Patricia Fuentes Melgar joint the leading team and years later when the Association for the Scientific and Cultural Promotion of the Heritage of Zamora was created the  supervising group was completed by Manuel Vazquez Fadon.
Excavations have been carried out since 2007 to date with a gap year in 2011. In these six campaigns three areas have been studied: Defensive systems,  the metalworking district and the big storehouse.

Schematic Rock Art

In a shelter located just few meters below the site (In the cliff down to the river), some samples of schematic art have been discovered. The images represent human-like icons, sticks, fingers, anchor-shaped symbols, circles and indefinites. Painted in red colour on quartzite, they belong to the Bronze Age with an age of more than 3.000 years.