William of Rubruck
A remark by William of Rubruck about the origin of the population called "Illac" i.e. Vlachs resulted with historians erroneous considerations. This opinion considered that the "Blaci"/"Blasi" of Anonymous, "Blacki" of Simon of Kéza and Villehardouin, "Blaci" of William of Rubruck, Roger Bacon and Johannes Schöner, even of the Hungarian charters between 1222 and 1224, were not related to the Latin Vlachs, instead there was a difference between Turkic "Blac"/"Blaq" and Latin "Vlach" people.