I am not experienced with researching EuroAristo genealogy, but found some obvious duplicate profiles (thanks to Kenneth Shelton).
There are four duplicate profiles for Margery (de) Nottingham, who married John Marmion-35. I've proposed merges for all four into the lowest numbered profile (Nottingham-46).
Attempted to do due diligence on sourcing but was unable to find anything on Margery, her father Henry Nottingham-68, or her grandfather Henry Nottingham-69. I searched the Medieval Lands database as suggested, but without success. Her husband John Marmion-35 is not directly listed, though his grandfather is.
Would someone with more experience in this varsity level genealogy kindly take a look? I'll go back to the New Jersey stuff where I sometimes know what I'm doing. :)