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According to local tradition, the Asturian King Silo founded the monastery, although there is no direct documentary proof from that period.
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A charter mentions the existence of a monastic community at Obona, indicating the presence of organized religious life.
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The monastery possibly functioned as a double monastery for monks and nuns. The physical structure from this period is unknown due to later reconstructions
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Abbot Pelayo is recorded as the monastery's leader, providing evidence of ecclesiastical organization and land ownership.
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The monastery officially adopts the Benedictine rule. The Romanesque church is constructed, including a triple-apsed chevet (eastern end).
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The central and side naves of the church are completed. The apse is reformed with larger dimensions and slightly pointed arches.
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The façade and main entrance to the church are finalized, integrating Romanesque stylistic features with local stonework.
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A documented peaceful agreement establishes territorial boundaries between the monastery and the town of Tineo.
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Bishop Gutierre de Toledo implements spiritual and administrative reforms to improve discipline and economy.
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The archive, located on the upper floor, is actively used for storing legal and land documents. It becomes essential for monastic control over property.
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A fire destroys much of the archive and surrounding structures, leading to a significant loss of documents and historical memory.
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Obona joins a reformed monastic congregation, gaining new administrative oversight. This marks a turn toward centralized managemen
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The cloister's north wing might have been renovated. Other minor architectural changes and maintenance works are recorded.
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A new institution is established within the monastery to provide theological and humanist education to novices and nearby students.
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Baroque cloister and porter's lodge constructed.
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The monastery's entry courtyard is completed with a bakery, jail, stables, and other functional buildings for daily operations.
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Several windows are enlarged. Interior circulation is improved, and the water cistern is upgraded for better monastic hygiene.
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The monastery is secularized and its property confiscated by the liberal Spanish government. Monastic life ceases.
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New secular schools are constructed in existing south-west wing cloister. The surrounding square is modified to fit public education needs.
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Some Romanesque elements are replaced, and structural repairs to the roof and floors are undertaken, sometimes inaccurately.
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The site gains national legal protection as a historical and artistic monument.
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Several excavation campaigns reveal substructures, walls, and burial remains, helping reconstruct Obona’s early phases.
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A detailed architectural and preservation plan is drafted, aiming to restore and reuse the complex sustainably. The plan was criticized for not having connections with existing and never realized
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Archaeological surveys further reveal construction sequences and foundations of lost buildings.
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Recognized as a Cultural Heritage Site of Spain, ensuring regional and national protection.
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Hispania Nostra includes the site in the “Red List” of endangered cultural heritage due to its abandonment and vulnerability.
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The pilgrimage route passing Obona is declared a World Heritage Site, increasing interest in the monastery's revival.