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No primary documentation has been found to prove the ancestry of Roger I de Montgomerie.
One theory is that his father was called Guillaume who descended from a Dane/Viking called Gormeric.
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from "Origin and History of the Montgomerys", B.G. de Montgomery 1948.
Gommer had three sons : Guillam, ancestor of the Montgomerys; Bernardus Danus, ancestor of the Dukes of Harcourt; and Sihtric, a Viking chief, described as the grandson of Ingvar Ragnarson (Annals of the Four Masters). Bernardus Danus called Sihtric to his assistance against the King of France (vide p. 28).
...
It seems doubtful whether Gormeric's son William already used the name of Montgomery. One knows with certainty, however, that William's grandson Roger bore the name.
https://dcms.lds.org/delivery/DeliveryManagerServlet?dps_pid=IE1086074
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930 |
930
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St-Germain-de-Montgomery, Calvados, Normandy, France
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960 |
960
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Saint Germain, Normandy, France
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980 |
980
Age 50
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Paris, Paris, Île-de-France, France
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