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Male Marmaduke de Thweng Click to view Marmaduke de Thweng in the family tree

Marmaduke's father was Marmaduke de Thweng and his mother was Lucy de Brus.  His maternal grandparents were Baron of Skelton Peter de Brus II and Hawise de Lancaster. He had a brother and two sisters, named Robert, Cecilia and Margery.1 

Family Details of Marmaduke's family with Isabel de Ros

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=remme1007&id=I203126

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