William (Sir) I de ROS & Lucia\Lucy FITZ PIERS 
They had a son named Robert IV de.
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Personal Details
William (Sir) I de ROS
William (Sir) I de was born after 1196 in Helmsley Castle, North Ride, Yorkshire, England. He died in 1264 in Poitou, France.
Lucia\Lucy FITZ PIERS
Lucia\Lucy was born about 1205 in Brecknock, Wales. She died after 1266 in England.
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Children
Robert IV de ROS
Robert IV de was born about 1233 in Helmsley Castle, North Ride Yorkshire, England. He died on May 17th, 1285 in Belvior Castle, Leicestershire, England.