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

Marmaduke was born in September 1256 in Kilton Castle, Brotton, Yorkshire, England.1   Marmaduke's father was Marmaduke de Thwenge and his mother was Lucia De Bruce.  His maternal grandparents were Peter II De Bruce and Hawise de Lancaster. He had three brothers and two sisters, named Robert, Sir John, Sir Edmund, Margery and Alice.  He was the oldest of the six children.  He died at the age of 67 in 1323 in Thweng, Yorkshire, England.1 

1 Isabel de Ros.ged
Further sources/citations:
De Bruce.ged, http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=clcaldwell&id=I012994

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