Sigiran(d) or Sigiramnus, later known as Saint Cyran, founded a monastery at Longoret around 632 CE on land offered to him by Dagobert I for that purpose.
In 1620 Jean Duvergier de Hauranne, who introduced Jansenism into France, became the abbey's commendatory abbot.
Opposed to the Jesuits, he fell into disgrace under Cardinal Richelieu and was imprisoned.
A few decades after 1790 Moulins de Paris bought it and later turned it into holiday homes for its employees.
[1] It protected Paul Touvier, fleeing from charges of crimes against humanity, until the police seized his baggage there on May 21, 1989.