Born James Herbert Fellowes, he was the son of James Fellowes of Kingston Maurward House near Dorchester, Dorset who was the youngest son of William Henry Fellowes of Ramsey Abbey in Huntingdonshire by his wife, Emma the daughter of Richard Benyon of Gidea Hall in Essex.
Neilson's first major work was her doctoral dissertation, Economic Conditions on the Manors of Ramsey Abbey, in which she investigated the economic affairs of the lands held by Ramsey Abbey in the Middle Ages.
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Although Byrhtferth and Ramsey Abbey remembered Æthelwine favourably, calling him Dei amicus (friend to God), the monks of nearby Ely saw him as an enemy who had seized their lands.
These include a life of Saints Æthelberht and Æthelred in the Historia Regum, compiled at Ramsey Abbey and perhaps to be associated with Byrhtferth, a life of Mildrith by Goscelin written to rebut the claims by St Gregory's Priory at Lyminge to possess the relics of Saints Mildrith and Eadburg, while the claims of St Gregory's are preserved in a manuscript held in Gotha.
Its script and decoration suggest that it was made at Winchester, but certain liturgical features have suggested that it was intended for use at the Benedictine monastery of Ramsey, or for the personal use of Ramsey's founder St Oswald.
An account of Geoffrey's outlaw actions and the taking of the Ramsey Abbey provides for elements of the backstory for two of Ellis Peters' "Brother Cadfael" books, The Potter's Field and The Holy Thief.
He was offered the site of Ramsey Abbey in Huntingdonshire by Æthelwine, son of Æthelstan Half-King, and Oswald established a monastery there about 971 that attracted most of the members of the community at Westbury.
The church was founded in 1858 by Mrs Emma Fellowes, widow of William Henry Fellowes of Ramsey Abbey, Cambridgeshire, and was opened in 1859.