Mauger Seigneur de St. Clair 
Mauger Seigneur de was born in 1004 in St Clair-sur-Elle, Manche, Normandy, France. He died at the age of 43 in 1047.
They had two sons named Walderne de and William.
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Children
Walderne de St. Clair
Walderne de was born about 1025 in St Clair-sur-Elle, Manche, Normandy, France.
William Sinclair , 1st Lord of Rosslyn
William was born about 1028 in St Clair-sur-Elle, Manche, Normandy, France. He died in 1078 in Killed by English in Northumberland, England.
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