What does the Parson tell Durbeyfield about his lineage?

From the text:

It was on account of a discovery I made some little time ago, whilst I was hunting up pedigrees for the new county history. I am Parson Tringham, the antiquary, of Stagfoot Lane. Don't you really know, Durbeyfield, that you are the lineal representative of the ancient and knightly family of the d'Urbervilles, who derive their descent from Sir Pagan d'Urberville, that renowned knight who came from Normandy with William the Conqueror, as appears by Battle Abbey Roll?"