The inspiration for the series comes from many sources, including family, friends, and European times. Rangers are based on two groups of people, the Texas Rangers and the US Army Rangers of World War II. Although the US Rangers were based on British Commandos, Flanagan felt it would be better to use Rangers because of the medieval setting of the book. The mythical world of the story is based on England, Europe, and Scandinavia because Flanagan was inspired by "English and European culture and history". Besides this, John Flanagan is also interested in military subjects, which helped him write the battle scenes. Celtica's mining culture is like Wales while Gallica takes its name and language from medieval France in its chivalric age around the year 1300.