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My research interests have centred on the history of the western European aristocracy. I began with a study of the Norman followers of William the Conqueror in 1066, which took as its focus the family of Roger de Montgommery. This led to work on the origins of these families in western France, the changes of the year 1000 and French history to 1200. I have undertaken a study of the hermit monks of Tiron, one of the so-called new monastic orders of the twelfth century, published by Cambridge University Press in 2014, and I am currently working on the history of Ponthieu in the eleventh and twelfth centuries. I am also interested in the medieval and early modern history of Bristol, and have published texts dating from the sixteenth century with the Bristol Record Society.