At the end of the eleventh century, a group of would-be conquerors followed a goose on crusade.

The standard (and almost certainly overly simplistic) narrative of the First Crusade is that, in 1095 Pope Urban II rallied religious leaders at the Council of Clermont to retake the Holy Land. After a few stirring speeches and cries of “deus vult!” (God wills it!) a holy war began. Again, this narrative is almost certainly factually incorrect, but it’s stayed in the popular imagination.

The First Crusade, though, was far more disorganized than its neat and tidy origin myth suggest. Several lords, kings, and independent military leaders operated more or less independently. One of the most notable leaders of what would become known as the People’s Crusade was an itinerant preacher named Peter the Hermit who stirred his followers with tales of apocalypse, end times, and final battles. Among Peter the Hermit’s followers was a group of crusaders who followed a goose, claiming that that bird was speaking to them through the Holy Spirit.