At Peterborough and Rochester, Ernulf had the old buildings torn down and erected new dormitories, refectories, chapter house, etc.
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Ernulf studied under Lanfranc at the monastery of Bec, entered the Benedictine Order, and lived long as a brother in the monastery of St-Lucien, Beauvais.
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:For the given name Ernulf, Earnulf, see Arnulf.
Monks of the priory have included Æthelric I, Æthelric II, Walter d'Eynsham, Reginald fitz Jocelin (admitted as a confrater shortly before his death), Nigel de Longchamps and Ernulf.
Weston Coyney is identified in the Domesday Book as a manor called Westone or West Town in lands belonging to Robert de Stafford and held by Ernulf de Hesding.