question: Which Italian Catholic priest and Renaissance humanist  is best known for his textual analysis that proved that the Donation of Constantine was a forgery?
answer: Lorenzo (or Laurentius) Valla
context: Title: Erasmus
  Passage: Desiderius Erasmus Roterodamus ( ; 28 October 1466 – 12 July 1536), known as Erasmus or Erasmus of Rotterdam, was a Dutch Renaissance humanist, Catholic priest, social critic, teacher, and theologian.
  Title: Donation of Constantine
  Passage: The Donation of Constantine ( ) is a forged Roman imperial decree by which the 4th century emperor Constantine the Great supposedly transferred authority over Rome and the western part of the Roman Empire to the Pope.  Composed probably in the 8th century, it was used, especially in the 13th century, in support of claims of political authority by the papacy.  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.
  Title: Lorenzo Valla
  Passage: Lorenzo (or Laurentius) Valla (] ; 14071 August 1457) was an Italian humanist, rhetorician, educator and Catholic priest.  He is best known for his textual analysis that proved that the Donation of Constantine was a forgery.
citations: Donation of Constantine Lorenzo Valla