Australia's senior Roman Catholic prelate, and one of Pope Francis' top advisers, has been charged with sexual assault, the police in the Australian state of Victoria said on Thursday. The prelate, Cardinal George Pell, became the highest-ranking Vatican official in recent years to face criminal charges involving accusations of sexual offenses. The case will test the credibility of Francis' initiatives to foster greater accountability after abuse scandals that have shaken the church around the world. Cardinal Pell, the Vatican's de facto finance chief, had been accused in hearings before Australia's Royal Commission Into Institutional Responses to Child Sexual Abuse of mishandling misconduct cases against clergy members while he served as the leader of the Archdioceses of Melbourne and Sydney. Then allegations surfaced that he had sexually abused minors himself beginning early in his priesthood and continuing until he became archbishop of Melbourne. In recent decades, more than 50 Roman Catholic bishops worldwide have been accused of sexually abusing children, according to BishopAccountability.org, an advocacy group ... that documents sexual abuse in the church. Few, however, have faced criminal charges. It is rare for a cardinal, a prince of the church, to be accused of sexual abuse, though one of the most notorious cases involved Cardinal Hans Hermann Gror of Vienna, who resigned in 1995 over accusations that were deemed credible by his successor.