After its foundation in the 12th century, Flaran Abbey experienced rapid growth.
In the middle of the 13th century, the abbey, jointly with Gerald V, Count of Armagnac, founded the fortified town of Valence-sur-Baïse[1] on a hillside on the other side of the Baïse river.
The abbey did not escape the vicissitudes of history, beginning with the Hundred Years' War, which ended with the Plantagenet county of Gascony being realigned with France.
In 1913, the Archaeological Society of Gers intervened so that the abbey would not end up in the architectural collection of George Grey Barnard that resulted in The Cloisters museum in New York City.
The site houses a permanent exhibition on the pilgrimage route to Santiago de Compostela, the Way of St. James.