The Children's Crusade is the name given to a variety of fictional and factual events which happened in 1212 that combine some or all of these elements: visions by a French or 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.
A study published in 1977 cast doubt on the existence of these events and many historians now believe that they were not (or not primarily) children but multiple bands of "wandering poor" in Germany and France, some of whom tried to reach the Holy Land and others who never intended to do so. Early versions of events, of which there are many variations told over the centuries, are largely apocryphal.
The Children's Crusade is a series of possibly fictitious or misinterpreted events of 1212. The story is that an outburst of the old popular enthusiasm led a gathering of children in France and Germany, which Pope Innocent III interpreted as a reproof from heaven to their unworthy elders. The leader of the French army, Stephen, led 30,000 children. The leader of the German army, Nicholas, led 7,000 children. None of the children actually reached the Holy Land: those who did not return home or settle along the route to Jerusalem either died from shipwreck or hunger, or were sold into slavery in Egypt or North Africa.