It is the best example of medieval military architecture in Galicia. It was built by Gonzalo Ozores de Ulloa around 1375. It has a square floor plan and is surrounded by a wall with an irregular floor plan that adapts to the land. The walls are made of masonry and granite ashlar. The central building is made up of the tower. with a square floor plan. flanked by four other smaller ones. also square. which are located at each of the corners of the main one and connected to each other by a wall. The interior courtyard is accessed by a lintel doorway in the wall. Inside. there is a four-air granary placed partly over the outer wall. It has a rectangular floor plan. with a granite structure and a wooden balustrade.