Trevejo Castle origin dates back to before the 12th century when a Muslim fortress stood in its place, serving as the basis for its construction in the 15th century. The original fortress was conquered by Alfonso VII of León, who handed it over to the Order of the Temple. In 1184, by order of King Fernando II of León, it passed into the hands of the Order of St. John of Jerusalem. Two years later, the same monarch decided to give it to the Order of Santiago. Over the course of history, it also came to belong to the Order of Alcántara.
During the French invasion of the peninsula, the castle was destroyed to prevent Spanish guerrillas from taking refuge in it.
Today, the homage tower and a large part of the wall still resist the passage of time. At the foot of the castle, there are a series of anthropomorphic stone tombs, allegedly containing the remains of some of the warrior monks who were initially owners of the castle.
Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.