Some time shortly after the Norman Conquest, the manor of Everdon was granted to the abbey of St. Mary of Bernay, Eure, in Normandy.
The abbot held advowson of the parish church, i.e. the right to present a priest to the living - a right that could be lucrative, as incumbents generally paid to be inducted, although this was technically the sin of simony.
They had been taking a mark (money) for offences against the Assize of Bread and Ale, which regulated quantities and prices of these basic commodities; the culprits should have been subjected to the tumbril and pillory, instead of which the monks had been using convictions as a source of profit for their order.
This cyclical process was ended by Henry V. Planning the war against France that would culminate in the Agincourt campaign, he put legislation before Parliament to dissolve the alien priories, Everdon included.
This later allowed Henry VI to grant it to his newly founded Eton College in 1440, a gift that was confirmed by Edward IV in 1462.