Lord Robert Thweng 
Robert was born in Kilton, York, England.. Robert's father was Robert Thweng. He was an only child. He died after 1238.General Notes
pg 532, " A Genealogical History of the Dormant, Abeyant, Forfeited and Extinct Peerages of the British Empire" by Sir Bernard Burke, published 1883
vol 2, pg 147, Burke's "Commoners of Great Britain and Ireland"
He had a biological son named Marmaduke.
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