Plumpton
Generation 19:
Isabella Plumpton
+Stephen de Thorpe b. circa 1385
--Stephen de Thorpe b. circa 1410
--William de Thorpe
--Henry de Thorpe
Generation 20:
+Alice Gisburn
--Sir Robert Plumpton
--William Plumpton
--Brian Plumpton
--George Plumpton (cleric)
--Thomas Plumpton
--Richard Plumpton
--Isabella Plumpton
--Jane Plumpton
--Katherine Plumpton
Generation 21:
Sir Robert Plumpton
+Isabella le Scrope
Generation 22:
Sir William de Plumpton
+Christian Mowbray
--Sir Robert Plumpton
Generation 23:
Sir Robert de Plumpton, Lord Plumpton
+Lucia de Roos
--Sir William de Plumpton
Generation 24:
Sir Robert de Plumpton
+Isabella de Westwick
--Sir Robert de Plumpton, Lord Plumpton
Generation 25:
Nigel de Plumpton
+Avice de Clare
--Sir Robert de Plumpton
Generation 26:
Robert de Plumpton
+Unknown
--Nigel de Plumpton
Generation 27:
Nigell de Plumpton
+Juliana de Warewic
--Robert de Plumpton
Generation 28:
Peter de Plumpton
+Lady Helena
--Nigell de Plumpton
Generation 29:
Eldredus de Plumpton
+Petronilla Unknown
--Peter de Plumpton
Generation 30:
Nigel de Plumpton
+Hilda Unknown
--Eldredus de Plumpton
Generation 31:
Petrus de Plumpton
+Unknown
--Nigel de Plumpton
Generation 32:
Nigelus de Plumpton
+Maria Uknown
--Petrus de Plumpton
Generation 33:
Robert "de Plumpton"
+Arelete A. H. de Normandy
--Nigelus de Plumpton
Some genealogies link this line as descending from Robert I of Normandy (father of William the Conqueror); however, I am unable to find any clear information of there being a link here.