The origin of the noble family that founded this house are the Sarmiento de Valladares, who were the military rulers for several generations of the town of Salvaterra.

Among them we highlight Jácome Sarmiento de Valladares III, who, being a master of the infantry field, was appointed by the Rei governor of the Plaza de Salvaterra in times of the war against Portugal. To him is due the restoration of the pazo in 1677, since it had been destroyed years before by the Portuguese army when it invaded the villa in 1642. An inscription made under one of the shields located on the wall of the patio of the house marks the origin of the modern history of the Pazo de las Barreras:

The last descendants of the house were men of letters who intertwined ties with other important houses in the province. The pazo was built with the stone of the demolished watchtower of Santiago de Aytona, and after this first reconstruction it was rehabilitated again in 1979. Finally, it later became the headquarters of the Señorío de Lazoiro winery in 1996. The pazo's military past, the old stables and loopholes of the defensive walls are preserved.

It stands out for its crenellated and emblazoned portal that leads to a cozy courtyard where the well stands out, the stone staircase that ascends to the emblazoned courtyard and the roof supported by columns with a square section. The whole pazo is in a very good state of conservation. The pazo has three shields. Two of them are located in the solarium and refer to the grandparents and parents of Jácome III. The Sarmiento, Valladares, Castro and Lobato lineages appear on the shield on the left, while the Suárez, Araújo, Sotelo and Salado are reflected on the one on the right. Under the shield on the right is the inscription mentioned above. The third shield is what is found in the entrance gate. Made in 1777, in the time of Francisco Antonio Carballido y Sarmiento, religious and descendant of the house, this large shield contains 14 different lineages that refer to the ancestors of the pazo.