ACKNOWLEDGMENTS

I thank my esteemed teachers Régis Boyer and Georges Zink (Sorbonne); my old friend Ronald Grambo (Oslo) for his help; Jon Graham for his ongoing interest in my books and for his translations; and, last but not least, Michael Moynihan for valuable references and suggestions for expanding and updating the information in this volume.

Fig. 1. Picture stone from Lärbro on the island of Gotland, Sweden, eighth century. Photo by Jürgen Howaldt.