Question:  Franciscus Titelmans  was a Flemish Franciscan scholar, an opponent of what Dutch Renaissance humanist, Catholic priest, social critic, teacher, and theologian?
Sentence (from "Donation of Constantine"): Lorenzo Valla, an Italian Catholic priest and Renaissance humanist, is credited with first exposing the forgery with solid philological arguments in 1439–1440, although the document's authenticity had been repeatedly contested since 1001.
Relevant evidence: No