Origin and history
The abbey of Arthous, founded around 1167 by the order of pre-demonstrated canons, implanted in a complex geopolitical context, at the borders of Béarn, Navarre and Aquitaine. Its name, from the Artós gascon ("green oak"), reflects the local landscape of the 12th century. The church, of late Romanesque style with unique nave, is distinguished by its tripartite bedside adorned with 35 carved modillons illustrating sins, virtues and scenes of salvation. These decorations, as well as the capitals representing canons with liturgical instruments or building tools, bear witness to a symbolism both spiritual and practical.
The Wars of Religion marked a destructive turning point: in 1523 the Spanish troops captured the abbey, then in 1569, the Protestants of Montgomery looted it and burned it, destroying archives and claustral buildings. The reconstruction spanned the seventeenth to eighteenth centuries, with an imposing abbatial home, a cloister and canon cells. Father Louis de Montesquiou (died 1732) ordered the construction of a new bell tower in 1726–27, while Jacques-Marie de Romatet added in 1750 the east gate and an adjoining building. Two summary plans (circa 1760 and 1790) documented the abbey before its sale as a national property in 1791.
Classified as a Historical Monument in 1955 (church) and 1969 (conventual buildings), the abbey was saved in 1964 by a donation to the Landes department, which began its restoration. Since 2003, the site has been home to the Departmental Heritage Centre and a museum of history and archaeology, presenting prehistoric collections (sorde-l'Abbaye fields), Gallo-Roman and medieval. The current exhibitions and internships build on this heritage, while valuing its historical role as a stage on Via Turonensis of the pilgrimage of Compostela, with a hospital attested from 1327 for the poor pilgrims.
The architectural study reveals distinct construction phases: the southern absidiole, the first built in local limestone, first functions as an autonomous church, followed by the central abside and the northern absidiole, the latter replacing a pre-existing low building. The transept, vaulted in Romanesque cradle, and the nave (32.8 m long), originally carpented, show traces of vaulting abandoned in the sixteenth century. The cross, vaulted dogives in the 14th century, bears the stigma of the fires of the Wars of Religion. The west façade, reworked in the 17th century, originally retained a sculpted tympanum portal (zodiac, calendar), with fragments remaining.
The convent buildings, rebuilt after 1635 by order of Abbé Salvat Gratien de Gardera, illustrate modern canonical architecture: abbey house, refectory, cells and cloister with two galleries. The north wall reveals a partial reconstruction in the fourteenth century, perhaps for a first abbey house. The task-marks and modillons of the apses (representing canons bearing stones or liturgical instruments) highlight the link between spirituality and collective labor. The abbey had a vast land heritage, including priories (Pagolle, Subernoa) and farmland, which had been rented in modern times before their sale in 1791.
Historical sources, though fragmentary, include a lost obituary (partial copies by Arnaud Oihenart in 1628 and Antoine Degert in 1924), acts preserved in the Departmental Archives, and stories of wars (Nicolas de Bordenave, 1873). The academics had little interest in Arthous, with the exception of Philippe Bonnet (1983) for his pre-demonstrated architecture. Today, the site is part of the Major Sites of Aquitaine project, alongside Brassempouy and Sorde, to enhance an archaeological heritage covering 25,000 years of regional history.
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