Robert de Ros & Margaret de Brus 
They had a son named Thomas.
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Personal Details
Robert de Ros
Robert was born in 1194 in Wark, Northumbria.1 He died at the age of 80 on April 20th, 1274.1
Margaret de Brus
Margaret was born in 1211 in Wark, Northumbria.1 She died at the age of 95 on January 30th, 1306.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=rbrucew&id=I10780&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=rbrucew&id=I9314
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=rbrucew&id=I9314