The moth and the fields
The foundational narrative associated with the religious cult in Mourão recounts the apparition of Our Lady of Light to Saint Adrian in the so-called 'Campos da Lousa', an unusual image where the divine figure initially appears in the form of a moth and is later surrounded by celestial choirs over a holm oak, as recorded by the Oral and Religious Tradition of Mourão in 2026. This prodigious vision serves as the spiritual pillar for a community that annually keeps alive the most deeply rooted devotional practices in the Central Alentejo region.
The centrality of this devotion is materialized in the Festival of Our Lady of Light, an event held annually on the first Sunday of September, lasting for four days of intense pilgrimage, according to the Parish Council of Luz and the Municipality of Mourão in 2026. To these summer celebrations are added the festivities in honor of Our Lady of Candelaria, celebrated annually on February 2 by the Parish of Mourão and the Municipality of Mourão in 2026, maintaining a secular liturgical calendar in the town.
However, the landscape where these memories are anchored has undergone radical transformations that have redefined the physical and human geography of the municipality. The geomorphological area submerged by the Alqueva Great Lake in the surroundings of Mourão permanently altered the riparian ecosystems of the Guadiana River, redefining visible and submerged archaeological heritage, as attested by the Portuguese Environment Agency and EDIA in 2025.
The sword and the parchment
If oral tradition speaks of miracles and celestial apparitions, royal chancery documents reveal strictly military and geopolitical motivations for the birth of the burgh. The first Charter granted to the town of Mourão dates back to 1226, the year King Sancho II donated the settlement to the Knights Hospitaller with the clear objective of encouraging its settlement and defense in a dangerous border zone, according to data from the Municipality of Mourão and the Knights Hospitaller.
Almost three centuries later, the Portuguese Crown felt the need to update and consolidate local administration, granting the Manueline charter to the town of Mourão in the year 1511, a period when the defensive and administrative structures of the municipality were reinforced, according to the records of Manuel I. This legal evolution contrasts with the slowness of the demographic and spatial transformations that characterize the Alentejo interior over the following centuries.
The population density and demographic indicators of the municipality of Mourão have registered a sharp contraction in recent decades, directly fitting into the national trend of interiorization and demographic aging of Central Alentejo, as underlined by the National Statistics Institute in the 2021 censuses. This population decline contrasts with the stony monumentality that endures at the top of the local elevations.
The stone and the bastion
The rural morphology of the municipality of Mourão shows elevations with an altitude superior to 150 meters in its orographic structure, clearly highlighting Cabeço, at 276 meters of altitude, and Cantarinho, at 253 meters, according to the Geographic Institute and the Parish Council of Mourão in 2026. It is upon these terrain eminences that the defensive system was erected to visually dominate the dry horizons of the Alentejo plain.
The construction of the current structure of Mourão Castle began in 1343 by explicit order of Afonso IV, bearing an architectural trait whose authorship is attributed to master João Afonso, according to the records of the Portuguese Monarchy. Centuries later, facing new technological demands of warfare, the 17th-century fortifications of Mourão Castle were deeply restructured during the Restoration Wars, incorporating four bastions and ravelins adapted to the artillery of the time, according to the plan of the War Council of the Portuguese Crown in 1664.
In a demonstration of heritage continuity in the present, the City Council of Mourão concluded in March 2025 the LED scenic lighting project for Mourão Castle, a technical intervention aimed at enhancing the historical heritage and the imposing line of walls visible from all over the town.
The myth beneath the waters
The most obvious reading would assume that the foundation legends of Mourão and Aldeia da Luz possess direct medieval documentary records proving the chronological veracity of the oral miracles transmitted from generation to generation. However, official documents and archaeological excavations demonstrate that human occupation resulted from strictly military border contingencies and medieval reorderings promoted by the Knights Hospitaller, dissociating mythological creation from strict archival proof, according to data from EDIA and the municipality.
The most blatant example of this separation between oral myth and scientific excavation is found in Castelo da Lousa, a Roman fortification dating back to the 1st century BC that is linked to the historical and legendary genesis of the former parish of Luz and is currently submerged by the waters of the Alqueva Dam, according to EDIA reports in 2002. This submersion permanently altered the landscape and forced an unprecedented geographic reconfiguration in the region.
The territorial zone affected by the submersion of Alqueva in Mourão implied the complete relocation of the population of the former Aldeia da Luz to a new settlement planned from scratch, the completion of which occurred at the turn of the millennium, as recorded in documents by EDIA and the Government of Portugal from 2002. This drastic process also included the temporary suppression of the municipality of Mourão itself between July 12, 1895, and January 13, 1898, a period during which the territory of the parish of Luz administratively integrated the municipality of Reguengos de Monsaraz, according to records from the Civil Government and Central Administration in 1895.
The climate and the silence of the ground
The harshness of Mourão's landscape is also shaped through a very pronounced thermal and rainfall regime, where the average annual precipitation in the municipality hovers around 500 mm, heavily concentrated between the months of October and March. This value contrasts sharply with an extremely dry summer semester, where the average precipitation drops abruptly to about 170 mm, according to climatological data from IPMA in 2026.
This cycle of humid winters and arid summers defines the rhythms of dryland agriculture and the secular isolation of rural estates and homesteads that characterize the Alentejo territory around the town. The absence of ancient written records about certain local legends highlights the weight of spoken tradition facing the scarcity of archival documents preserved over the centuries.
While the 2025 LED lighting draws the nocturnal contours of the medieval walls and the Alqueva lake forever covers the secrets of Castelo da Lousa, Mourão continues to manage the gap between what the stone testifies in the royal charters of 1226 and what only the memory of the elders dares to tell about divine moths.