^While the Catholic Church considers itself to be the authentic continuation of the Christian community founded by Jesus Christ, it teaches that other Christian churches and communities can be in an imperfect communion with the Catholic Church.
^Quote of St Ignatius to the Smyrnaeans (c. 110 AD): "Wheresoever the bishop shall appear, there let the people be, even as where Jesus may be, there is the universal [katholike] Church."
^Example use of "Roman" Catholic by a bishop's conference: The Baltimore Catechism, an official catechism authorised by the Catholic bishops of the United States, states: "That is why we are called Roman Catholics; to show that we are united to the real successor of St Peter" (Question 118) and refers to the church as the "Roman Catholic Church" under Questions 114 and 131 (Baltimore Catechism).
^In 1992, the Vatican clarified the 1983 Code of Canon Law removed the requirement that altar servers be male; permission to use female altar servers within a diocese is at the discretion of the bishop.
^For an outline of the Eucharistic liturgy in the Roman Rite, see the side bar in the "Worship and liturgy".
^Marriages involving unbaptised individuals are considered valid, but not sacramental. While sacramental marriages are insoluble, non-sacramental marriages may be dissolved under certain situations, such as a desire to marry a Catholic, under Pauline or Petrine privilege.
^The Divine Worship variant of the Roman Rite differs from the "Anglican Use" variant, which was introduced in 1980 for the few United States parishes established in accordance with a pastoral provision for former members of the Episcopal Church (the American branch of the Anglican Communion). Both uses adapted Anglican liturgical traditions for use within the Catholic Church.
^With regard to divorce in the United States, according to the Barna Group, among all who have been married, 33% have been divorced at least once; among American Catholics, 28% (the study did not track religious annulments).
^According to Roman Catholic Womanpriests: "The principal consecrating Roman Catholic male bishop who ordained our first women bishops is a bishop with apostolic succession within the Roman Catholic Church in full communion with the pope."
^ Joyce, George (1913). "The Pope" . In Herbermann, Charles (ed.). Catholic Encyclopedia. New York: Robert Appleton Company. Regarding Peter as the first Bishop of Rome, "It is not, however, difficult to show that the fact of his [Peter's] bishopric is so well attested as to be historically certain. In considering this point, it will be well to begin with the third century, when references to it become frequent, and work backwards from this point. In the middle of the third century St. Cyprian expressly terms the Roman See the Chair of St. Peter, saying that Cornelius has succeeded to "the place of Fabian which is the place of Peter" (Ep 55:8; cf. 59:14). Firmilian of Caesarea notices that Stephen claimed to decide the controversy regarding rebaptism on the ground that he held the succession from Peter (Cyprian, Ep. 75:17). He does not deny the claim: yet certainly, had he been able, he would have done so. Thus in 250 the Roman episcopate of Peter was admitted by those best able to know the truth, not merely at Rome but in the churches of Africa and of Asia Minor. In the first quarter of the century (about 220) Tertullian (De Pud. 21) mentions Callistus's claim that Peter's power to forgive sins had descended in a special manner to him. Had the Roman Church been merely founded by Peter and not reckoned him as its first bishop, there could have been no ground for such a contention. Tertullian, like Firmilian, had every motive to deny the claim. Moreover, he had himself resided at Rome, and would have been well aware if the idea of a Roman episcopate of Peter had been, as is contended by its opponents, a novelty dating from the first years of the third century, supplanting the older tradition according to which Peter and Paul were co-founders, and Linus first bishop. About the same period, Hippolytus (for Lightfoot is surely right in holding him to be the author of the first part of the "Liberian Catalogue" – "Clement of Rome", 1:259) reckons Peter in the list of Roman bishops...."
^While ruling contraception to be prohibited, Pope Paul VI did, however, consider natural family planning methods to be morally permissible if used with just cause.