Robert De Ros
- Born: 1115, Holderness, East Riding, Yorkshire
- Marriage: Sybil De Valognes in 1147 in Helmsley, North Riding, Yorkshire
- Died: 1163, Helmsley, North Riding, Yorkshire aged 48
 Noted events in his life were:
• Marriage: to Sybil de Valognes, 1147, Helmsley, North Riding, Yorkshire.
Robert married Sybil De Valognes, daughter of Roger De Valognes and Agnes Fitz John, in 1147 in Helmsley, North Riding, Yorkshire. (Sybil De Valognes was born in 1128 in Bennington, Hertfordshire and died in November 1217.)
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