Its beginnings could be found in a tournament at ?ry, where Fulk of Neuilly preached, and it is also suggested that the blinding of Enrico Dandolo and his subsequent vendetta may have inspired it.  
King Emeric of Hungary was one of its targets.  A meeting between Philip of Swabia and Boniface of Montferrat may have helped bring it about, as it has been argued that Philip intended to return a pretender from the Angelus family to the throne.  Its beginnings could be found in a tournament at ?ry, where Fulk of Neuilly preached, and it is also suggested that the blinding of Enrico Dandolo and his subsequent vendetta may have inspired it.  It is remembered mostly from the works of Nicetas Choniates and Geoffrey of Villehardouin [vee-hahrd-whan], who was one of the Franks involved in it.  It began with an invasion of the Adriatic city of Zara, and ended with the establishment of the Latin Empire under Baldwin of Flanders.  FTP name this crusade that saw the Venetians and Franks capture Constantinople.
King Emeric of Hungary was one of its targets.  A meeting between Philip of Swabia and Boniface of Montferrat may have helped bring it about, as it has been argued that Philip intended to return a pretender from the Angelus family to the throne.  
Fourth Crusade