"The Franciscan Sinai, where Saint Francis wrote the Rule in a mountain cave"
Santuario francescano di Fontecolombo
Fontecolombo, Lazio, Italia
In the summer of 1223, Saint Francis of Assisi retreated to a cave on the forested slopes of Monte Rainiero, five kilometers from Rieti, and spent forty days writing the definitive Rule of his order. The Regula Bullata, approved by Pope Honorius III that November, would govern the largest religious order in Christianity. The cave, the forest, the spring of doves that gave the place its name: Fontecolombo remains a living Franciscan sanctuary, the place where a radical vision became a governing document.
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Quick Facts
Location
Fontecolombo, Lazio, Italia
Tradition
Site Type
Coordinates
42.3794, 12.8283
Last Updated
Mar 9, 2026
Saint Francis wrote the definitive Franciscan Rule here in 1223 during a forty-day retreat in the Sacred Cave. The sanctuary complex grew around the cave, with the church consecrated in 1450. It is one of four Franciscan sanctuaries forming the mystical cross of the Valle Santa.
Origin Story
Francis is traditionally believed to have first come to Fontecolombo in 1217, drawn by the forested slopes and the clear spring. The decisive event came in the summer of 1223, when Francis, having struggled with earlier versions of his Rule through years of internal debate within the growing order, retreated to the cave on Monte Rainiero for forty days of prayer and fasting. He emerged with the text of the Regula Bullata, which Pope Honorius III solemnly approved on November 29, 1223. Francis returned in 1225 for a painful eye operation performed at the sanctuary, testimony to the physical suffering that marked his later years.
Key Figures
Saint Francis of Assisi
Wrote the Regula Bullata in the Sacred Cave
Pope Honorius III
Approved the Regula Bullata on November 29, 1223
Cardinal Nicholas of Cusa
Consecrated the sanctuary church on July 19, 1450
Spiritual Lineage
Franciscan Order (Order of Friars Minor). One of four sanctuaries forming the Valle Santa cross, alongside Greccio, Poggio Bustone, and La Foresta.
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