The initial research came to me through George Kendall Gillberry who had collected papers passed down through Ruth Geldart (a founder member of Cumbria F. S.), Arthur Brewin (grandson of Clement and Martha Mossop (neé Coulthard ) of Rottington, Dr. This input would not have been possible without the contributions of Marshall & Jean Mossop, George Kendall Gillberry, the late Grant Dixon, Maggie Blyth and all the other persons who have added their own family line.
Mossop who was descended from the Seascale/Lincolnshire branch.
I have researched our main line back through Moses of Rottington Hall and on to known descendants.
For the rest I have relied on several good people who have provided registration certificates, parish register information, census returns, churchyard inscriptions, wills and family knowledge.
Gillberry, I have not yet had access to all the parish registers for all dates, all wills, nor examined all the census returns.
The first mention of these families appears to be in Gosforth area of West Cumberland.
There is a story, probably fanciful, that the first of this name was a foundling, discovered by a monk on a bank of moss outside an abbey and given the surname "Moss Crop".
It certainly seems to be true that the early origins of the name of those who eventually changed to Mossop are confined to this area.
The above covers the known lines of those researching so far and linking back to William of Prior Scale.
There are more descendants whose details are not given in full.