William De Ross, b: 1196 - Helmsley, England


			^{Nigell de Plumpton}^{b.1216 Plumpton, Yorkshire, England d.1271 Plumpton, Yorkshire, England}

		^{Sir Robert de Plumpton}^{b.1239 d.1295 Grassington, England}

	^{Robert de Plumpton}^{b.1268 Knaresborough, England d.1325 Plumpton, Yorkshire, England}

		^{Isabella de Westwick}^b.1243 d.

^{Sir William de Plumpton}^{b.1294 Plumpton, Yorkshire, England d.1362 Plumpton, Yorkshire, England}			^{William De Ross}^{b.1196 Helmsley, Yorkshire, England d.1246 Kirkham, Yorkshire, England}

		^{William de Ros}^{b.1244 Ingmanthorpe, England d.1310 Grey Friars, England}	^{Lucy FitzPiers}^{b.1205 Forest of Dean, England d.1266 Yorkshire, England}

	^{Lucy de Ros}^{b.1270 Plumpton, Yorkshire, England d.1332 Plumpton, Yorkshire, England}

		^{Eustace FitzHugh}^{b.1268 Riding, England d.1310 Grey Friars, England}