Robert was one of the barons that followed Edward the Confessor to England. "As staller, he was a member of the royal household and he was one of those present at the deathbed of the king; on the Bayeux tapestry he is probably the person supporting the cushion on which the dying Edward leans. Since Little Domesday reports (Domesday Book, 2.44, 44v, 45v) that some of his estates were given him after the death of King Edward (a circumlocution for the unmentionable reign of Harold II) it can be presumed that he continued in Harold's service." (Ref: ODNB)
"His mother, Wimarc (Guimara) has a Breton name, but that of his father is not recorded. Since he is said to have been related both to the Confessor and to William I, he was perhaps an illegitimate scion of the Norman ducal house; Osbert de Clare says he was outstanding [praeclarus] among the Norman people because of his birth (La vie de S. Édouard, 108). Robert attested charters of the Confessor from 1059 and had built his castle at Clavering, Essex, by 1052." (Ref: ODNB)
He was a large landholder even before 1066. Domesday shows him with 150 hides of land in seven shires, the bulk of it in Essex. He would have been the tenth richest layman below the rank of earl.
Robert probably died around 1070, as his son Swein held the same office in the 1070s.
Seems to have been a prudent man, with a fair degree of wisdom who helped to ease the transition from Saxon to Norman England
He was a kinsman of both Edward the Confessor and of William the Conqueror and was present at Edward's death bed. (Ref: Wikipedia)
Known in modern literature as Robert fitz Wimarc, he took the name of his mother, Guimar, as an identifier, filio/filius Wymarche/Wymarcha . More reliable results will show in a search for Wimarc, Wymarche or Wimarche.
Earliest reference showing his name (found on the internet as of 2014-08-18. By Robert Gordon Latham from The English Language, page 303, Edition 5. Publisher Walton, 1862.
EADWEARD 1066 (No 828 Kent) Eadward King gret Eiidsi Arcebiscop and Godwine Biscop on Rowcestre and Leofwiine eorll on Kente and Esgar stallere and Roberd Wymarche sune stallere and alle mine pegnes on Kente frendlic.
The History of Rochford Hundred ...: From Former Authors, Ancient Manuscripts and Church Registers, Treating Upon Various Subjects, Including Notices of Churches and Chapels, the Clergy, Biography and Genealogy of Families ... and ... Other Matters, Volume 2, Author Philip Benton, Publisher A. Harrington, 1888, Original from the New York Public Library, Digitized Mar 21, 2007
Regesta regum anglo-normannorum, 1066-1154 (1913). Author: Great Britain. Sovereign; Davis, H. W. Carless (Henry William Carless), 1874-1928; Whitwell, R. J. (Robert Jowitt), d. 1928; Johnson, Charles, 1870-1961, Volume: 1. Publisher: Oxford : Clarendon Press. Call number: SRLF_UCI:LAGE-1421402. Digitizing sponsor: Internet Archive. Book contributor: University of California Libraries. This book has an editable web page on Open Library. Includes bibliographies: v.1. Regesta Willelmi Conquistoris et wilhelmi Rufi, edited by H. W. Davis.- v.2. Regesta Henrici Primi, 1066-1135, edited by Charles Johnson and H. A. Cronne.- v.3. Regesta Regis Stephani ac Mathildis Imperatricis ac Gaufridi et Henrici Ducum Normannorum, 1135-1154, edited by H. A. Cronne and R. H. C. David.- v.4. Facsimiles of original charters and writs of King Stephen, the Empress Matilda, and Dukes Geoffrey and Henry, 1135-1154, edited by H. A. Cronne and R. H. C. Davis
The History of Rochford Hundred ...: From Former Authors, Ancient Manuscripts and Church Registers, Treating Upon Various Subjects, Including Notices of Churches and Chapels, the Clergy, Biography and Genealogy of Families ... and ... Other Matters, Volume 2, by Philip Benton, Publisher A. Harrington, 1888, Original from the New York Public Library, Digitized Mar 21, 2007