Marguerite de Fiennes

✓ Marguerite (Margaret) de Fiennes (d. 1334), daughter of Guillaume II de Fiennes and Blanche de Brienne; kinswoman of Queen Eleanor of Castile ('Margaretam filiam domini Willielmi de Fendles de Hispania... dominae Alianorae reginae Angliae consanguineam', Wigmore narrative); wife of Edmund I de Mortimer. Her parents Guillaume II de Fiennes x Blanche de Brienne wired 20 Oct 2026 (rings into Enguerrand II de Fiennes and, through Blanche, into Alfonso IX of Leon - the source of her kinship to Queen Eleanor). Source: Medieval Lands (fmg.ac, Cawley), 'English Nobility Medieval 2' (Mortimer). [DIRECT ANCESTOR OF THE COMPILER: flag added 20 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]