Adela de Cotentin (de Vernon)

There is no Adele de Vernon listed in the Medieval Lands database, just an ADELISA [Alice] de Reviers who was married to Richard de Angerville. There is a possibility that Adele and Adelisa could have been sisters or that the information about an Adele de Vernon married to Niel de Saint Sauveur is incorrect.

From Medlands:

http://fmg.ac/Projects/MedLands/NORMAN%20NOBILITY.htm#RichardRevier...

The primary source which confirms her parentage and marriage has not yet been identified. Her husband's grant of land to Montebourg abbey was confirmed by her brother Richard de Reviers[2245]. m as his first wife, RICHARD de Angerville, son of ---.

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See Niel III (IV) de Saint Sauveur, Vicomte of Cotentin