Interactive tree of Petronilla de Grandmesnil

Lady Elizabeth Comyn –1289

Gilbert de (Umfraville) Umfreville 1244–1307

Lady Elisabeth de Quincy –

Alexander Comyn 1217–1289

Roger de Quincy 2nd Earl of Winchester 1195–1264

Helen of Galloway 1208–

Margaret de Beaumont –

Saer de Quincy 1st Earl of Winchester 1170–1219

Petronilla de Grandmesnil 1145–1212

Robert de Beaumont 3rd Earl of Leicester –1190

Robert de Beaumont 2nd Earl of Leicester 1104–1168

Amice de Montfort –

Robert de Beaumont 1st Earl of Leicester 1040–1118

Elizabeth (or Isabel) de Vermandois 1085–1148

Hugh I Count of Vermandois 1057–1101

Adelaide of Vermandois 1062–1122