For Barry, il mio vichingo. —DJN

For my very dear friend Joe Boyle …
a Norse traveler if ever there was one. —CB

Enormous gratitude for guidance throughout this project goes to Professor Scott Mellor of the Department of Scandinavian Studies at the University of Wisconsin at Madison. The author and illustrator also thank the National Geographic team who worked on this project for their resourcefulness, energy, and wisdom: Amy Briggs, Priyanka Lamichhane, Hillary Leo, and David Seager.