Boniface of MontferratBoniface of Montferrat may refer to:Boniface I, Marquis of Montferrat, leader of the Fourth Crusade and king of Thessalonica from 1204Boniface II, Marquis of Montferrat, also titular king of Thessalonica from 1239Boniface III, Marquis of Montferrat Boniface IV, Marquis of Montferrat