The exact date Charley Priory was established is unknown, but is at some point before 1190.

In 1190, Petronilla de Grandmesnil, Countess of Leicester donated the priory to the Benedictine Abbey of Saint-Evroul in Normandy.

The gift was confirmed at the beginning of the 13th-century, with the abbey under the control of Ware Priory, a subordinate of Saint-Evroul.

At the time 3 monks lived at the priory but it is unclear if they followed the Augustinian or Benedictine order; as a hermitage they may not have followed any definite rule.

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