
Fernando Álvarez de Toledo y Pimentel, 3rd Duke of Alba, known as the Grand Duke of Alba in Spain and Portugal and as the Iron Duke in the Netherlands, was a Spanish noble, general and diplomat. He was titled the 3rd Duke of Alba de Tormes, 4th Marquess of Coria, 3rd Count of Salvatierra de Tormes, 2nd Count of Piedrahita, 8th Lord of Valdecorneja, Grandee of Spain and a Knight of the Order of the Golden Fleece. His motto in Latin was Deo patrum nostrorum.

Fernando Cardenal Martínez was a Nicaraguan Jesuit and liberation theologian.

The Cardinal protector of England was an appointed crown-cardinal of England from 1492 until 1539. A cardinal protector is the representative of a Roman Catholic nation or organisation within the College of Cardinals, appointed by the pope. The role was terminated as a result of the English Reformation.

The issue of slavery was historically treated with concern by the Catholic Church. Throughout most of human history, slavery has been practiced and accepted by many cultures and religions around the world, including ancient Rome. Certain passages in the Old Testament sanctioned forms of temporal slavery as means to pay a debt. Slaves were restored their freedom and previous property every 50 years on a year of Jubilee, if their debt was not already paid. The Catholic Church still celebrates the Jubilee year.

The Catholic League for Religious and Civil Rights, often shortened to the Catholic League, is an American Catholic organization whose stated purpose is to "defend the right of Catholics – lay and clergy alike – to participate in American public life without defamation or discrimination." The Catholic League states that it is "motivated by the letter and the spirit of the First Amendment ... to safeguard both the religious freedom rights and the free speech rights of Catholics whenever and wherever they are threatened." According to the Encyclopedia of American Religion and Politics, the league "is regarded by many as the preeminent organization representing the views of American lay Catholics."

Catholic–Protestant relations refers to the social, political and theological relations and dialogue between the Catholics and Protestants.

Catholics for Choice (CFC) is a dissenting Catholic abortion rights advocacy group based in Washington, D.C. Formed in 1973 as Catholics for a Free Choice, the group gained notice after its 1984 advertisement in The New York Times challenging Church teaching on abortion led to Church disciplinary pressure against some of the priests and nuns who signed it. It has lobbied nationally and internationally for abortion rights goals and led an unsuccessful effort to downgrade the Holy See's status in the United Nations. CFC was led for 25 years by Frances Kissling and is currently led by its President Jamie L. Manson.

Beda Chang was a Chinese-French Jesuit priest. He was martyred after being tortured during a wave of persecution by the communist government.

The Chinese Rites controversy was a dispute among Roman Catholic missionaries over the religiosity of Confucianism and Chinese rituals during the 17th and 18th centuries. The debate discussed whether Chinese ritual practices of honoring family ancestors and other formal Confucian and Chinese imperial rites qualified as religious rites and were thus incompatible with Catholic belief. The Jesuits argued that these Chinese rites were secular rituals that were compatible with Christianity, within certain limits, and should thus be tolerated. The Dominicans and Franciscans, however, disagreed and reported the issue to Rome.

The Cincinnati riot of 1853 was triggered by the visit of then-Archbishop Gaetano Bedini, the emissary of Pope Pius IX, to Cincinnati, Ohio, on 21 December 1853. The German Liberal population of the city, many of whom had come to America after the Revolutions of 1848, identified Cardinal Bedini with their reactionary opponents. An armed mob of about 500 German men with 100 women following marched on the home of Bishop John Purcell, protesting the visit. One protester was killed and more than 60 were arrested.

Lodovico delle Colombe was an Italian Aristotelian scholar, famous for his battles with Galileo Galilei in a series of controversies in physics and astronomy.

The Congregatio de Auxiliis was a commission established by Pope Clement VIII to settle a theological controversy regarding divine grace that had arisen between the Dominicans and the Jesuits towards the close of the sixteenth century. It was presided over for a time by Peter Lombard, Archbishop of Armagh.

The Congregation of Mary Immaculate Queen is a sedevacantist traditionalist Catholic religious congregation.

Correctio filialis de haeresibus propagatis is an August 11, 2017 petition initially by 62 critics of Pope Francis, who argued that the pope propagated heresies, with regard to seven theological issues the authors identified in Amoris laetitia, an apostolic exhortation by Pope Francis dated March 29, 2016 and in other related statements. The authors released the twenty-five page document to the public on September 24, 2017, stating they had received no response from the Holy See.

The work of Catholic nun and missionary Anjezë Gonxhe Bojaxhiu, commonly known as Mother Teresa and from 2016 as Saint Teresa of Calcutta, received mixed reactions from prominent people, governments and organisations. Her practices, and those of the Missionaries of Charity, the order which she founded, were subject to numerous controversies. These include objections to the quality of medical care which they provided, suggestions that some deathbed baptisms constituted forced conversion, and alleged links to colonialism and racism and to relations to questionable public figures. The controversy extends to include the large sums of money donated to her as well as the Vatican for ignoring the criticisms raised.

Dissent from the Catholic Church's teaching on homosexuality has come in a number of practical and ministerial arguments from both the clergy and the laity of the Catholic Church. The Catholic Church teaches that while being gay is not a sin in and of itself, any sex outside of marriage, including between same-sex partners, is sinful, and therefore being gay makes one inclined towards this particular sin.

William Henry DuBay was a Catholic priest and activist whose activities and suspension from the priesthood created controversy in the mid-1960s. He has since published widely on Church reform, the rights of ethnic and sexual minorities, and plain language.

The Eastern Orthodox Church is opposed to the Roman Catholic doctrine of papal supremacy. While not denying that some form of primacy could exist for the Bishop of Rome, E. Orthodox Christians argue that the tradition of Rome's primacy in the early Church was not equivalent to the current doctrine of supremacy.
Catholic–Orthodox ecclesiastical differences are differences between the organizational structure and governance of the Eastern Orthodox Church and that of the Catholic Church. These are distinguished from theological differences which are differences in dogma and doctrine. A number of disagreements over matters of Ecclesiology developed slowly between the Western and Eastern wings of the State church of the Roman Empire centred upon the cities of Rome and New Rome/Constantinople respectively. The disputes were a major factor in the formal East-West Schism between Pope Leo IX and Patriarch Michael I in 1054 and are largely still unresolved between the churches today.
Alfonso de Galarreta Genua, SSPX, is a Spanish-born Argentine bishop of the Society of Saint Pius X. Bishop de Galarreta has served as the First Assistant of the Society of Saint Pius X, working under the direction of the Superior General Fr. Davide Pagliarani, since 2018. In addition to this, Bishop de Galaretta has been the President of the SSPX—Vatican Commission since 2009, which directs the Society's correspondence with the Holy See.

Galileo di Vincenzo Bonaiuti de' Galilei was an astronomer, physicist and engineer, sometimes described as a polymath, from Pisa, in modern-day Italy. Galileo has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and the "father of modern science".

John Anthony Hardon was an American Jesuit priest, writer, and theologian. He is recognized by the Catholic Church as a Servant of God.

Hippolytus of Rome was one of the most important second-third century Christian theologians, whose provenance, identity and corpus remain elusive to scholars and historians. Suggested communities include Palestine, Egypt, Anatolia, Rome and regions of the mideast. The best historians of literature in the ancient church, including Eusebius of Caesarea and Jerome, openly confess they cannot name where Hippolytus the biblical commentator and theologian served in leadership. They had read his works but did not possess evidence of his community. Photios I of Constantinople describes him in his Bibliotheca as a disciple of Irenaeus, who was said to be a disciple of Polycarp, and from the context of this passage it is supposed that he suggested that Hippolytus so styled himself. This assertion is doubtful. One older theory asserts he came into conflict with the popes of his time and seems to have headed a schismatic group as a rival to the bishop of Rome, thus becoming an antipope. In this view, he opposed the Roman Popes who softened the penitential system to accommodate the large number of new pagan converts. However, he was reconciled to the Church before he died as a martyr.

Adolf Hitler's religious beliefs have been a matter of debate. His opinions regarding religious matters changed considerably over time. During the beginning of his political life, Hitler publicly expressed favorable opinions towards Christianity. Some historians describe his later posture as being "anti-Christian". He also criticized atheism.

The Catholic Church considers sexual activity between members of the same sex to be a sin. This teaching has developed through a number of ecumenical councils and the influence of theologians, including the Church Fathers. The Catholic Church opposes the acceptance of homosexuality within Christian society.

Pope Leo I, also known as Leo the Great, was bishop of Rome from 29 September 440 until his death. Pope Benedict XVI said that Leo's papacy "was undoubtedly one of the most important in the Church's history."

The Malleus Maleficarum, usually translated as the Hammer of Witches, is the best known treatise on witchcraft. It was written by the Catholic clergyman Heinrich Kramer and first published in the German city of Speyer in 1486. It has been described as the compendium of literature in demonology of the 15th century. The top theologians of the Inquisition at the Faculty of Cologne condemned the book as recommending unethical and illegal procedures, as well as being inconsistent with Catholic doctrines of demonology.

Medjugorje, a village in Bosnia and Herzegovina, has been the site of alleged apparitions of the Virgin Mary since 24 June 1981. Various officials of the Catholic Church have attempted to discern the validity of these Marian apparitions in order to provide guidance to potential devotees and pilgrims. On 7 December 2017, it was reported that Archbishop Hoser, Pope Francis' envoy to Medjugorje, announced that official pilgrimages are allowed, stating, "dioceses and other institutions can organize official pilgrimages.” This pilgrimage was officially authorized by the Holy See in May 2019. The approval was not intended to signify recognition of the apparitions, but acknowledge the faith and pastoral needs of the pilgrims.

The Vatican sexual abuse summit, officially the Meeting on the Protection of Minors in the Church, was a four-day Catholic Church summit meeting in Vatican City that ran from 21 to 24 February 2019, convened by Pope Francis to discuss preventing sexual abuse by Catholic Church clergy.

In a historical perspective, Catholic Modernism is neither a system, school, or doctrine, but refers to a number of individual attempts to reconcile Catholicism with modern culture; specifically an understanding of the Bible and Catholic tradition in light of the historical-critical method and new philosophical and political developments of the late 19th and early 20th centuries—and implicitly all that this might entail.

Maria Monk was a Canadian woman whose book Awful Disclosures of Maria Monk, or, The Hidden Secrets of a Nun’s Life in a Convent Exposed (1836) claimed to expose systematic sexual abuse of nuns and infanticide of the resulting children by Catholic priests in her convent in Montreal.

Mr. Belloc Objects to "The Outline of History" is a 1926 short book written by the British novelist H. G. Wells as a rebuttal of the criticism of historian Hilaire Belloc. In 1926, Belloc published his A Companion to Mr. Wells's "Outline of History" as a critique of Wells’ earlier historical textbook, The Outline of History. A devout Roman Catholic, Belloc was deeply offended by Wells’ treatment of Christianity in The Outline.

Paul Zachary Myers is an American biologist who founded and writes the Pharyngula science-blog. He is associate-professor of biology at the University of Minnesota Morris (UMM) where he works in the field of developmental biology. He is a critic of intelligent design (ID), the creationist movement, and has been a vocal critic of religious belief in general.

Papal supremacy is the doctrine of the Catholic Church that the Pope, by reason of his office as Vicar of Christ, the visible source and foundation of the unity both of the bishops and of the whole company of the faithful, and as pastor of the entire Catholic Church, has full, supreme, and universal power over the whole Church, a power which he can always exercise unhindered: that, in brief, "the Pope enjoys, by divine institution, supreme, full, immediate, and universal power in the care of souls."

The political activity of the Catholic Church on LGBT issues consists of efforts made by the Catholic Church to support or oppose civil government legislation on issues of importance to LGBT people. The Church generally condemns all forms of violence against gay and lesbian people. However, the Church in certain countries has occasionally resisted efforts to decriminalize homosexuality or to introduce measures to tackle discrimination. The Catholic Church also supports legally defining marriage in civil legislation as the union of one man and one woman, therefore generally opposing efforts to introduce gay civil unions and gay marriage – although some clergymen have expressed support for same-sex unions. The Church teaches that not all discrimination is "unjust," and that discrimination against gay people in some spheres of life serves the common good.

The Regensburg lecture or Regensburg address was delivered on 12 September 2006 by Pope Benedict XVI at the University of Regensburg in Germany, where he had once served as a professor of theology. It was entitled "Faith, Reason and the University – Memories and Reflections". The lecture is considered to be among the most important papal statements on world affairs since John Paul II's 1995 address to the United Nations, and sparked international reactions and controversy.

The Religious Question was a crisis in the 1870s between the Catholic church and the state apparatus of the Brazilian Empire. It led to the imprisonment of two bishops and contributed to the downfall of the government of José Paranhos, Viscount of Rio Branco.

A sign of contradiction, in Catholic theology, is someone who, upon manifesting holiness, is subject to extreme opposition. The term is from the biblical phrase "sign that is spoken against", found in Luke 2:34 and in Acts 28:22, which refer to Jesus Christ and the early Christians. Contradiction comes from the Latin contra, "against" and dicere, "to speak".

The Tribunal of the Holy Office of the Inquisition, commonly known as the Spanish Inquisition, was established in 1478 by the Catholic Monarchs, King Ferdinand II of Aragon and Queen Isabella I of Castile. It was intended to maintain Catholic orthodoxy in their kingdoms and to replace the Medieval Inquisition, which was under Papal control. It became the most substantive of the three different manifestations of the wider Catholic Inquisition along with the Roman Inquisition and Portuguese Inquisition. The "Spanish Inquisition" may be defined broadly as operating in Spain and in all Spanish colonies and territories, which included the Canary Islands, the Kingdom of Naples, and all Spanish possessions in North, Central, and South America. According to modern estimates, around 150,000 people were prosecuted for various offences during the three-century duration of the Spanish Inquisition, of whom between 3,000 and 5,000 were executed.

The St. Bartholomew's Day massacre in 1572 was a targeted group of assassinations and a wave of Catholic mob violence, directed against the Huguenots during the French Wars of Religion. Traditionally believed to have been instigated by Queen Catherine de' Medici, the mother of King Charles IX, the massacre took place a few days after the wedding day of the king's sister Margaret to the Protestant Henry of Navarre. Many of the wealthiest and most prominent Huguenots had gathered in largely Catholic Paris to attend the wedding.

The Strelnikoff Mary of Help of Brezje controversy or the Strelnikoff Affair began after a depiction of Mary of Help of Brezje holding a rat instead of Jesus was published by the Slovenian music group Strelnikoff on the cover of their 1998 studio album Bitchcraft. The album was made in protest of the official views of the Roman Catholic Church in Slovenia and the statements of some of its highest representatives on the subject of abortion.

The suppression of the Jesuits was the removal of all members of the Society of Jesus from most of the countries of Western Europe and their colonies beginning in 1759, and with the approval of The Holy See in 1773. The Jesuits were serially expelled from the Portuguese Empire (1759), France (1764), the Two Sicilies, Malta, Parma, the Spanish Empire (1767) and Austria and Hungary (1782).
The Catholic Church and the Eastern Orthodox Church have been in a state of official schism from one another since the East–West Schism of 1054. This schism was caused by historical and language differences, and the ensuing theological differences between the Western and Eastern churches.

Tradition, Family, Property is an international movement of political/civic organizations of Traditionalist Catholic inspiration.

George Tyrrell was an Anglo-Irish Catholic priest and a leading modernist theologian and scholar. A convert from Anglicanism, Tyrrell joined the Jesuit order in 1880. His attempts to adapt Catholic theology to modern culture and science made him a key figure in the modernist controversy that raged within the Roman Catholic Church in the late 19th century. In the context of the anti-modernist campaign led by Pope Pius X, Tyrrell was expelled from the Jesuits in 1906 and finally excommunicated in 1908.