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Origin and history

The ruins of the so-called Lanleff Temple rotunda, located in Lanleff in the Côtes-d'Armor, constitute an exceptional Romanesque building by its circular plan, inspired by the Holy Sepulchre of Jerusalem. Although often associated with fanciful hypotheses (Roman, Gaulish or Templar temple), it is actually one of the first Marian rotundas in Europe, built between the 10th and 11th centuries. Its architecture, composed of two concentric enclosures separated by a stroll, and its 120 expressive sculptures (human, animal, geometrical) make it a jewel of Breton Romanesque art. The capitals and bases of columns, such as Adam's modesty with his fingers, bear witness to a rare artistic know-how for the time.

The first document mentioning the church of Sainte-Marie de Lanleff dates from the 11th–12th century: an undated act of donation of the monks of Léhon by Trihan de Chatelaudren, after 1061 but before 1148. After centuries forgotten, the building was rediscovered in the 18th century by Jean-Baptiste Ogée, who described its double structure and adorned columns. Prosper Mérimée, on a trip to Brittany, had him registered for the inventory of historical monuments in 1840 before his final classification in 1889. In the 19th century, the ruins served as a vestibule for the parish church of Sainte-Marie, built in 1859 nearby.

The debates on exact dating persist: some specialists propose the end of the 9th century because of the archaic style of sculptures, while others favour the 10th century, emphasizing the spatial and mural mastery of the building. Today, only one part of the outer enclosure remains, with two of the three original apsidioles. The Lanleff Temple, founded in 2008, conducts research and organizes visits to explore the mysteries of this monument, a symbol of the Breton religious heritage and the influence of medieval pilgrimages to Jerusalem.

Lanleff, a trève of Lanloup under the Ancien Régime, belonged to Goëlo County and the bishopric of Dol. The commune, erected in 1790, paid a heavy toll during the First World War (14 deaths, including 4 sailors), but none during the Second. The Temple, often wrongly called Temple of the Templars although there is no evidence linking order to this site, illustrates the importance of circular buildings in Breton religious architecture, such as the Holy Cross of Quimperlé. Its pink sandstone and cradle vaults, among the oldest in the region, make it a unique testimony of Romanesque innovation in Brittany.

Assumptions about its original function (baptistry, seigneurial church, Marian place of worship) remain open. However, excavations and stylistic studies reveal a likely religious destination, linked to Marian worship that emerged in the Middle Ages. The engaged columns, the full arches and the narrow windows of the outer enclosure betray a desire for monumentality, despite the modest dimensions (30 feet in diameter). Ranked a historic monument since 1889, the site is now owned by the commune and is subject to strict protections, while remaining accessible to the public for guided tours.

The region, marked by a mild oceanic climate and landscape of talqueous shale, was under the Old Regime a territory of unusable domains (the Local Covenants) and small seigneuries. Lanleff, enclaved in the bishopric of Saint-Brieuc but dependent on Dol, reflects medieval Breton geopolitical tensions. The Temple, with its sculptures with various influences (cels, Carolingian, oriental), could also bear witness to the cultural exchanges linked to maritime routes and pilgrimages, in a Brittany then turned towards England and the Mediterranean.

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