1) Catholic ecclesiastical title 2) Christian term 3) Clergyman 4) Man of the cloth 5) Reverend 
Latin, meaning: plaintiff, complainant. 
The person who guides a cause for beatification or canonization through the judicial processes required by the Roman Catholic Church is known as the postulator. The qualifications, role and function of the postulator are spelled out in the Norms to be Observed in Inquiries made by Bishops in the Causes of Saints, which has been in effect since 7 F...
official who presents case for canonization or beatification
The cleric that promotes a cause with the court of the Sacred Congregation of Rites for beatification or canonization
[n] - (Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization 2. [n] - someone who assumes or takes something for granted as the basis of an argument
noun someone who assumes or takes something for granted as the basis of an argument