Marmaduke de Thweng 
Marmaduke was born in 1180 in Helmsley, Yorkshire, England. Marmaduke's father is Sir Robert de Thweng. His paternal grandfather is Robert de Thweng. He was an only child. He died at the age of 54 in 1234.
They had a son named Robert.
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Children
Lord Robert de Thweng of Kilton
Robert was born in 1214 in Helmsley, Yorkshire, England. He died in Kilton Castle, Cleveland, Yorkshire, England.
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