 It became the first of a series of documents published by the Magisterium that claimed apostolic origin for clerical celibacy and reminded ministers of the altar of the perpetual continence required of them.It is known that the First Ecumenical Council which took place at Nicaea included in its legislation a discipline of the priesthood known as clerical 'continence' or celibacy.This was the requirement of all priests and bishops to refrain from sexual contact with their wives or with any other woman.