Anna M. Balaguer has published extensively on medieval Islamic, Castilian, Catalan, Aragonese and Portuguese coinages as well as the coinage of the Iberian peninsula. These publications include Del Mancús a la Dobla (1993) and Historia de la moneda dels comtats Catalans (1999) as well as articles and chapters in many other works. She is a member of the Asociación Numismática Española (Barcelona) and the Instituto de Sintra (Portugal).

Philip Grierson (1910-2006) was Professor of Numismatics, University of Cambridge, Fellow of Gonville and Caius College, Cambridge and formerly Professor of Numismatics and History of Coinage at the University of Brussels. He was Honorary Keeper of Coins at the Fitzwilliam Museum, to which he bequeathed his unrivalled collection of medieval European coins.