Castle of Alenquer: A Medieval Fortress and Urban Stronghold in Portugal
Site at a Glance
- Rating
- 4.2
- Popularity
- Low
- Country
- Portugal
- Primary era
- Medieval
- Eras represented
- Medieval
- Civilizations
- Portuguese, Umayyad
- Site type
- Military
- Remains
- Castle
On this page14 sections
History
Castle of Alenquer is a medieval fortress in Portugal, built over an earlier Muslim citadel and developed during the Christian Reconquista in the mid-twelfth century. Its position made it a defensive stronghold north of Lisbon, while its later association with Portugal’s royal women gave it an important place in the country’s political and dynastic history.
Before and during the Reconquista
Human occupation of the area reaches back to prehistory. Over successive periods, Greeks, Phoenicians, Carthaginians, Romans, Alans, Goths, and Muslims visited or occupied the site. After conquering the territory known as Alan Cana in 714, Muslim forces established the original fortress, or alcaçova, a fortified citadel forming the defended core of a settlement.
During the Reconquista, the medieval Christian reconquest of territories in the Iberian Peninsula ruled by Muslim powers, forces led by Afonso Henriques captured Alenquer after a two-month siege in 1148. Afonso Henriques, Portugal’s first king, ordered the settlement to be repopulated and probably began repairing or rebuilding its defenses. The castle’s medieval construction is broadly dated to the middle of the twelfth century.
Royal residence and military stronghold
By the first half of the thirteenth century, the castle had become an important defensive stronghold north of Lisbon. Sancho I, Afonso Henriques’s son and successor, built a royal palace there in 1211 and donated it to his daughter Sancha. She began living at Alenquer in 1212 after a dispute with her brother Afonso II, who later encircled the castle.
Also in 1212, Sancha granted Alenquer its first charter, a formal document defining the town’s legal rights, obligations, and administrative privileges. Pope Innocent III placed the castle under the custody of the Knights Templar in 1216. This medieval military-religious order, which defended Christian territories and pilgrimage routes, also held fortified sites in Portugal. Alenquer later received another charter from King Dinis in 1302 and a new one from Manuel I in 1510.
In 1340, ownership passed to Constância, queen consort of Pedro I. From then on, Alenquer formed part of the patrimony of the Portuguese queens and was successively donated to royal women. Queen Isabel initiated major building work in the fourteenth century, when the castle acquired its principal Gothic characteristics.
Conflict, damage, and decline
Castilian forces captured Alenquer in 1384. The Master of Aviz, the head of the Portuguese military Order of Aviz and the future King John I, then besieged the fortress. Its alcalde, Vasco Pires de Camões, surrendered after conspiring with the opposing side. As punishment, the victorious commander ordered the cornerstones of the keep to be removed and the walls to be lowered.
Leonor Teles ordered the walls to be raised again in 1439. Around 1578, the castle’s cistern fell into ruin. During the Portuguese succession crisis of 1580, Alenquer supported António, Prior of Crato, a royal claimant who opposed the Habsburg succession. The castle subsequently received little maintenance, deteriorated, and became a source of stone for local houses.
Modern alterations and archaeological recovery
A small chapel was built over the Nossa Senhora da Conceição Gate in 1740. In 1750, the Royal Academy and Joseph I recommended conserving the military grounds, but the proposal did not prevent further deterioration. The Lisbon earthquake of 1755 destroyed the gate’s two towers.
After the Battle of Buçaco in 1810, troops associated with the Lines of Torres Vedras were stationed at the castle, causing additional damage. During the nineteenth century, the municipal authority demolished part of the lower wall to create a gateway between the Nossa Senhora da Conceição Gate and the adjoining square.
Archaeologist Hipólito Cabaço cleared the ruined cistern in 1927 and recovered objects that helped date the structure. Excavations beside the Nossa Senhora da Conceição Gate in 1940 revealed evidence of a prehistoric settlement. During the subsequent archaeological recovery, Portugal’s former national service for monuments and historic buildings, the DGEMN, demolished the chapel above the gate and partially restored the walls, although the work remained unfinished.
The Castle and Urban Walls of Alenquer are owned by the Portuguese Republic and have been classified as an Immovable Cultural Heritage Property of Public Interest since 1955.
Remains
Enclosures and surviving walls
The castle occupies the highest point of Alenquer’s urban center, in a strategic position surrounded by forest. Its long, irregular plan follows the terrain, the historic organization of the town, and surviving elements of the earlier Muslim fortification. The walls extend beside the former Jewish quarter and enclose part of the urban area toward the Nossa Senhora da Conceição Gate and the corridor towers.
The Gothic castle was arranged in two enclosures. An upper courtyard followed the natural topography and incorporated the former Muslim alcaçova. A lower terrace covered a considerably wider area and protected the original urban settlement. Portions of the primitive Muslim fortress survive within the later complex.
Northern curtain wall
The northwest perimeter, part of the northern side, and walls around the tower survive from the original fortifications. The northern curtain wall contains three rectangular towers and two arched doorways. Its masonry consists of regular stonework, and the wall is crowned by rectangular merlons, the raised sections between battlement openings. An adarve, or wall-walk for defenders, runs along the top. In some areas, parapets protect the battlements, while an arched doorway provides access through the fortifications.
Main tower and defensive corridor
The principal rectangular tower rises 18.6 metres above the river. A corridor connects it to the walls and was intended to support the defense of the fortress. The tower and corridor were later reused as housing, and sections of the defensive walls were incorporated into local buildings.
Towers by the river
Near the river stands the square-plan Torre da Couraça, a defensive structure linking the fortification to water resources. The structures in this area reach approximately 18 metres in height. They are considered later additions and underwent substantial modification over time.
Gates, water facilities, and archaeological evidence
Nossa Senhora da Conceição Gate
The Nossa Senhora da Conceição Gate remains part of the castle’s defensive circuit. A chapel stood above it from 1740 until the twentieth-century archaeological recovery, when the DGEMN demolished the structure and partially restored the adjoining walls.
Cistern and spring
The interior contains a spring or fountain. The cistern, which had fallen into ruin by about 1578, was cleared by Hipólito Cabaço in 1927. Objects recovered from it contributed to dating the structure.
Prehistoric settlement
Excavations beside the Nossa Senhora da Conceição Gate in 1940 produced evidence of a prehistoric settlement on the site. This archaeological layer extends the history of occupation beyond the Muslim and medieval fortifications and forms part of the surviving archaeological record of the castle.
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