Zarzosa de Río Pisuerga (Spanish pronunciation: [θaɾˈθosa ðe ˈri.o piˈsweɾɣa]) is a municipality located in the province of Burgos, Castile and León, Spain.

A century later, in 1071, the king of Castile, Sancho II the Strong, delivered to Bermudo Sendínez[8][9] the monastery of Rezmondo with its subsidiary houses of Santa Columba of Zarzosa and San Miguel of Támara.

We do not know since when or why these council immunities were granted, but one hypothesis is that they were possibly related with the proximity of the frontier with the Cantabrians.

A royal judgement of Philip II in 1571 declared Zarzosa a municipality with its “civil and criminal jurisdiction, high, low, mere or mixed political authority, with all its tributes and taxes and all the rest of the lordship and jurisdiction in that municipality[19] through belonging to His Majesty and the crown”.

“Behetría” is understood as the town or place which does not admit, or consent, to hidalgos or nobles in its vicinity, as can be seen from the Dictionary of Authorities of the R.A.E.