The Children's Crusade was a failed popular crusade by European Christians to establish a second Latin Kingdom of Jerusalem in the Holy Land, said to have taken place in 1212. Although it is called the Children's Crusade, it never received the papal approval from Pope Innocent III to be an actual Crusade. The traditional narrative is likely conflated from a mix of factual and mythical events, which include the preaching of visions by a French boy and a German boy, an intention to peacefully convert Muslims in the Holy Land to Christianity, bands of children marching to Italy, and children being sold into slavery in Tunis. The crusaders of the real events on which the story is based left areas of Germany, led by Nicholas of Cologne, and Northern France, led by Stephen of Cloyes.

Crusade in Jeans is a 2006 Dutch film directed by Ben Sombogaart. It is an adaptation of the book Crusade in Jeans by Thea Beckman.