John Clark was for many years curator of the medieval collections at the Museum of London. Since retiring in 2009, he has continued research, lecturing and writing on topics including the history and archaeology of medieval London, medieval folklore and legends and their relationship to 'real' history, and medieval horses and horse equipment.

This book introduces the story of the 'Green Children' and how it has been interpreted, retold, and reworked. Analysing the two accounts, and offering fresh translations from the Latin originals, it considers what the historians tell us happened, and then the children's own story of their homeland.