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It is known that the Ferrieres family owned and operated a large ironworks that turned out weaponry for centuries in St. Hilaire, the most important or most ancient of the forges.
The two special endowments were held by the lords of Ferrieres in demesne and later became the seat of their Norman barony.
The Ferrieres emerged as one of the four great Norman baronial families and lined up on the side of the duke -- one of the family's rare politically correct decisions.