Nielsen Hayden genealogy
Family: Robert III de Plumpton / Lucy de Ros (F8457)
m. Aft May 1285-
Male
Robert III de Plumpton
Birth of Plompton, Yorkshire, England 
Death Between 1325 and 1326 Burial Marriage Aft May 1285 [1] Father Robert II de Plumpton | F8458 Group Sheet Mother Galiena | F8458 Group Sheet
Female
Lucy de Ros
Birth Death Burial Father William de Ros | F1374 Group Sheet Mother Eustache fitz Ralph | F1374 Group Sheet
Male
+ William Plumpton
Birth of Plompton, Yorkshire, England Death Aft 29 Mar 1362 Burial Spouse Christian de Mowbray | F8456 Marriage 30 Jun 1334
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Sources - [S6884] The Cartulary of St. Leonard's Hospital, York, Rawlinson volume I, ed. David X. Carpenter. Woodbridge, Suffolk: The Yorkshire Archaeological Society and the Borthwick Institute for Archives, in association with The Boydell Press, an imprint of Boydell & Brewer Ltd., 2015.
- [S6884] The Cartulary of St. Leonard's Hospital, York, Rawlinson volume I, ed. David X. Carpenter. Woodbridge, Suffolk: The Yorkshire Archaeological Society and the Borthwick Institute for Archives, in association with The Boydell Press, an imprint of Boydell & Brewer Ltd., 2015.