William De Roos
William was born about 1195 in Helmsley, Holderness, Yorkshire, England.

 Lucia FitzPiers
Lucia was born about 1200 in Blaen Lltfni & Bwich y, Brecknock, Wales.  She died after 1266.

 Robert De Ros
Robert was born about 1220 in England.  He died on May 17th, 1285.

 William De Ros
William was born about 1225 in Ingmanthorpe, Penistone, West Riding, Yorkshire, England.  He died in 1253 in Ingmanthorpe, Penistone, West Riding, Yorkshire, England.  He was buried in Church of Grey Friars, Yorkshire, England.

 Alexander De Ros
Alexander was born about 1229 in England.