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Dotter, Datter, Dottir are all the same, meaning "daughter" in Scandinavia, and attached behind of the father's first name. A woman kept her birth name all her life and did not take on her husband's last name as her own.
De Crepon and Denmark
spouse of King Gormsson
Gynrith was born about 0919. Gynrith Olafsdottar ... She passed away about 1000. 
ALTERNATE INFO: Olafsdottir aka Olafsdatter
Born 0905 in Uppsala,Uppsala,,Sweden
Daughter of Olof Mighty B. Munsö II
Sister of Bjorn Olafsson, Gunhild van Wenden of Sweden and Gyrithe O. Olafsdottir
Wife of Harald I S. Danmark
Mother of Thrya Tyri Tyra H. of Denmark
Died 0986 in Denmark
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