Some archaeological remains have been found in the municipality of "Siete iglesias de Trabancos" (Valladolid), but they are not well preserved, having been situated on the surface of the terrain. Such remains consist of, for instance, broken pieces of comb-decorated pottery that appear to date from Spain's Iron Age. There are few other examples of prehistoric findings directly along the Trabancos river. However, in the surrounding regions, such as the municipality of "Alaejos" (Valladolid), archaeological investigation has unearthed several human burials sites that have been dated to the Bronze Age. In addition, some prehistoric remains have been found near the mouth of the Trabancos River, in "Pollos" village that originated from the Duero River. These include relics of the Spanish Bronze Age classified as "Cogotas" pottery, as well as "Proto-Cogotas" pottery, both featuring incised decoration.