I know nothing supporting this theory, but considering history and modern affairs, could the Crusades have been a Jewish led larp? Replace all rhetoric in favor of "the holy land" with Israel, then consider how the Iraq war was in the name of freedom and democracy (the new secular religion of the west), but was obviously done partially on behalf of the Jews. I wouldn't be surpised at all if Jews in Constantinople or otherwise in the middle east convinced the Emperor to call for help from the Pope. Just a theory, a sort of shower thought, but does anyone know if there is a possibility that this hypothesis may be true?