The de Erleigh family, were chamberlains, sheriffs, judges and generals to the Norman monarchy. They are recorded in the pipe rolls as holding King's lands, the hundred of North Petherton, Somerset, in Grand Lease by virtue of their hereditary right to be chamberlains to the King. This fact, along with evidence from heraldry indicates that the first John de Erlegh (1100-1165) was the son of William de Tancraville (aka William Cameraeous), the chamberlain to Henry I, the grandson of the Chamberlain of Tancraville, who was listed in the roll of Falaise as being with the Conqueror at Hastings in 1066 and the great grandson of Ralph Fitzgerald de Tancarville (1005 to 1065), Chamberlain of Normandy and a Guardian of the young Duke William.
The de Tancarvilles were hereditary chamberlains to the Dukes (and earlier Jarls) of Normandy, and some members of the family took the name Chamberlain. The first lord of Tancraville (Tancred's town), was reputed to have arrived with Hrolf Gangler in 911AD. We can reasonably assume he was called Tancred. The likely third lord of Tancraville was known as Ralph FitzHerlwin, (son of Herlwin). Interestingly, Tancred and Herlwin are not Norse, English or Frankish names. These names are Germanic and of similar import; meaning Wise-thoughts and Earl's Friend, respectively suitable names for chamberlains.