This work could not have been completed without the collaboration of colleagues in the British Museum Department of Coins and Medals, in particular Richard Abdy, Sam Moorhead and Eleanor Ghey to whom I am grateful for their help, constant support and encouragement. I also wish to thank Dr Gareth Williams (Curator of Early Medieval Coinage at the British Museum) who has entrusted me with this work, allowing me to study one of the most important collections from this period. Thanks are also due to the external peer reviewer for providing extremely helpful insights and comments on the text.

I am grateful to the staff of the British Museum Collections Services and the Web Team who made this online catalogue possible, especially Tanya Szrajber, Alex Peters and David Prudames, as well as the guidance and advice of Dr JD Hill (Research Manager) and Sarah Faulks (Senior Editor, Scholarly Publications).