L´Isle-Adam is located south-west of Beaumont-sur-Oise, on the banks of the river Oise in the direction of Méry. The first family of seigneurs de l´Isle, in which the name Adam was used repeatedly, applied this name to their property which became known as l´Isle-Adam. The seigneurie passed to the Villiers family in the early 14th century on marriage with the heiress of the original family.
ADAM [II] de l'Isle (-[1092/93]). "Dominus Adam et Philippus suus filius nec non et uxor Philippi" donated property "apud insulam in tuwi sua" to Saint-Martin-de-Pontoise by charter dated to [1092], in which "Ansoldo fratre domini Adæ…Fulcone filio Alberici" are recorded as present[390]. m ---. The name of Adam's wife is not known. Adam [II] & his wife had two children