 The campaign was a complete success, convincing the English people that such a plan really existed.It was greatly aided by the decision in June 1673 by Charles's brother James, the Duke of York, to lay down his position as Lord High Admiral, which was generally (and correctly) interpreted as a sign that James had in secret become a Catholic and was therefore unable to abjure the transubstantiation doctrine, as the Test Act demanded of all officials.In September James married the Catholic Mary of Modena, a beautiful young girl especially selected for him by King Louis.