The Castle of Castro Laboreiro (Castelo de Castro Laboreiro) is located in the civil parish of Castro Laboreiro, in the municipality of Melgaço. It is the ruins of a Romanesque castle with a belt of walls around a central keep with a cistern.
In the 9th century, Alfonso III of Asturias, donated the settlement of Castro Laboreiro and the castro to Count Hermenegildo, grandfather of Saint Rudesind, for his defeat of the Visigoth King of Hispania, Witiza. During the reign of the Galician count, the castro was adopted as a castle, but would eventually fall into the possession of the Moors.
In 1144, Afonso Henriques reconquered the redoubt, and from 1145 his forces began the task of restoring and expanding the defenses: it was Sancho I of Portugal who finally completed the project in the 12th century. The efforts were for not, as the Leonese raised the castle in 1212, during their invasion. In 1290, Denis of Portugal began the reconstruction, with emphasis on defense from its neighbors.
The castle had, around 1506, five rectangular towers surrounding their central keep, which was preceded by the cistern in the north. Another, unidentified, construction was erected to the south.
In a surprise attack, Baltazar Pantoja took the castle after four hours of skirmishes in May 1666. He left Governor Pedro Esteves Ricarte in charge of the citadel, until it was retaken by the 3rd Count of Prado, Francisco de Sousa.
The King, citing its historical importance, decided to conserve the castle, in a response to his partner Michel Lescole, rather than deactivate it. Following the restoration of peace, in 1715, the castle was decommissioned. In 1801, troops occupied and defended the castle using four military pieces.
The castle is located on an isolated hilltop 1,033 metres above the Minho and Lima Rivers. It has an oval plan, oriented north-south, with the remains of the walls erected over cliffs and crags, sometimes zig-zagging, which corresponded to the ancient towers.
The principal entrance is the Gate of the Sun which opens to the east, while the 'traitors' gate', the Gate of the Frog as it was known, in the north. The east-west courtyard is closed and accessible from a footbridge that was used to gather cattle and property during invasions. It is around these walls that ruins of the ancient cistern remain.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.