The date of the foundation of the abbey is uncertain. The oldest date on record goes bad to 1051 when it appears as a part of the powerful Latium abbey of Farfa. The wealth of the monastic center reached its peak in the 13th century, when dependent upon it were a hospital, ten churches and twenty-three chapels in the territory between Assisi and FoIi­gno. At the end of the 14th century, the Monastero was abandoned by the monks and due to its strategic location became a refuge for the exiled citizens under the leadership of the Fiumi family. In 1391 the abbey was stormed by the Perugian troops, allies of the Nepis. In 1399 the Comune of Assisi demolished the abbey, desiring to thus free itself of the prob­lem of the rebels. In 1405 the abbey was given « in commendam », and so remained until 1834 when it passed to the Congregazione di Propaganda Fide. With the abolition of ec­clesiastical property in 1860 it passed into private hands. It was re-acquired by the Bene­dictines of San Pietro sul Monte Subasio in 1945, who saw to its restoration with the fi­nancial assistance of the Italian government. 
Of the abbey complex there now remain only the ruins of the surrounding outer walls. The church is from the second half of the 11th  century. It has a floor plan in the form of an Egyptian cross, with a single nave without a covering, a raised pres­bytery, and a crypt divided into five small aisles having eight columns with leaved capitals. In another part of the complex there is an older crypt which is evidence of an older settlement. It is supported by three columns and is perhaps from the 7th or 8th century, analogous with that of San Silvestro di Collepino on Monte Subasio.

Texts Kindly offered by: Editrice Minerva Assisi