Council of Constance in the context of "Pope Sixtus IV"

The Avignon Papacy (Occitan: Papat d'Avinhon; French: Papauté d'Avignon) was the period from 1309 to 1376 during which seven successive popes resided in Avignon (at the time within the Kingdom of Arles, part of the Holy Roman Empire, now part of France) rather than in Rome. The situation arose from the conflict between the papacy and the French crown, culminating in the death of Pope Boniface VIII after his arrest and maltreatment by agents of Philip IV of France. Following the subsequent death of Pope Benedict XI, Philip pressured a deadlocked conclave to elect the Archbishop of Bordeaux as pope Clement V in 1305. Clement refused to move to Rome, and in 1309 he moved his court to the papal enclave at Avignon, where it remained for the next 67 years. This absence from Rome is sometimes referred to as the "Babylonian captivity" of the Papacy (cf. Italian cattività avignonese, i.e. "Avignonese captivity").

A total of seven popes reigned at Avignon, all French, and all under the influence of the French Crown. In 1376, Gregory XI abandoned Avignon and moved his court to Rome, arriving in January 1377. After Gregory's death in 1378, deteriorating relations between his successor Urban VI and a faction of cardinals gave rise to the Western Schism. This started a second line of Avignon popes, subsequently regarded as illegitimate. The last Avignon antipope, Benedict XIII, lost most of his support in 1398, including that of France. After five years besieged by the French, he fled to Perpignan in 1403. The schism ended in 1417 at the Council of Constance.

The Renaissance Papacy was a period of papal history between the Western Schism and the Reformation. From the election of Pope Martin V of the Council of Constance in 1417 to the Reformation in the 16th century, Western Christianity was largely free from schism as well as significant disputed papal claimants. There were many important divisions over the direction of the religion, but these were resolved through the then-settled procedures of the papal conclave.

The popes of this period were a reflection of the College of Cardinals that elected them. The College was dominated by cardinal-nephews (relatives of the popes that elevated them), crown-cardinals (representatives of the Catholic monarchies of Europe), and members of the powerful Italian families. There were two popes each from the House of Borgia, House of della Rovere, and House of Medici during this period. The wealthy popes and cardinals increasingly patronized Renaissance art and architecture, (re)building the landmarks of Rome from the ground up.

The Council of Trent (Latin: Concilium Tridentinum), held between 1545 and 1563 in Trent (or Trento), now in northern Italy, was the 19th ecumenical council of the Roman Catholic Church. Prompted by the Protestant Reformation at the time, it has been described as the "most impressive embodiment of the ideals of the Counter-Reformation." It was the last time a Catholic ecumenical council was organized outside the city of Rome, and the second time a council was convened in the territory of the Holy Roman Empire (the first being the Council of Constance).

The Council issued key statements and clarifications of the Church's doctrine and teachings, including scripture, the biblical canon, sacred tradition, original sin, justification, salvation, the sacraments, the Mass, and the veneration of saints and also issued condemnations of what it defined to be heresies committed by proponents of Protestantism. The consequences of the council were also significant with regard to the Church's liturgy and censorship.

The Hussites (Czech: Husité or Kališníci, "Chalice People"; Latin: Hussitae) were a Czech proto-Protestant Christian movement influenced by both the Byzantine Rite and John Wycliffe that followed the teachings of reformer Jan Hus (fl. 1401–1415), a part of the Bohemian Reformation.

The Czech lands had originally been Christianized by Byzantine Greek missionaries Saints Cyril and Methodius, who introduced the Byzantine Rite in the Old Church Slavonic liturgical language and the Byzantine tradition of Communion in both kinds administered by the holy spoon. Over the centuries that followed, however, the Roman Rite in Ecclesiastical Latin, which is less easily understood than Slavonic by native speakers of Old Czech, was imposed upon the Czech people despite considerable public resistance, by German-speaking bishops, beginning with Wiching, from the Holy Roman Empire. (See also Sázava Monastery). As a cultural memory of both communion in both kinds and the Divine Liturgy in a language closer to the vernacular is believed to have survived well into the Renaissance, the ideas of Jan Hus and others like him swiftly gained a wide public following. After the trial and execution of Hus at the Council of Constance, a series of crusades, civil wars, victories and compromises between various factions with different theological agendas broke out. At the end of the Hussite Wars (1420–1434), the now Catholic-supported Utraquist side came out victorious from protracted conflict against Jan Žižka and the Taborites, who embraced the more radical theological teachings of John Wycliffe and the Lollards, and became the dominant Hussite group in Bohemia.

Conciliarism was a movement in the 14th-, 15th- and 16th-century Catholic Church which held that supreme authority in the Church resided with an ecumenical council, apart from, despite, or even if opposed by, the pope.

The movement emerged in response to the Western Schism between rival popes in Rome and Avignon. It was proposed that both popes abdicate in order to allow a new election that implemented a proposal where government supporters of the popes withdraw allegiance and thus prepare the way for a new election. The schism led to the summoning of the Council of Pisa (1409), which failed to end the schism, and the Council of Constance (1414–1418), which had more success, but which also proclaimed its own superiority over the Pope. Conciliarism reached its apex with the Council of Basel (1431–1449). The eventual victor in the warring movements was the pope and the institution of the papacy: the pope's power and teaching authority was confirmed by the condemnation of conciliarism at the Fifth Lateran Council (1512–1517). The apex of the theory of papal authority, on the other hand, was probably reached with the adoption of the doctrine of papal infallibility, promulgated (ironically) by the First Vatican Council (1870).

Jean Charlier de Gerson (13 December 1363 – 12 July 1429) was a French scholar, educator, reformer, and poet, Chancellor of the University of Paris, a guiding light of the conciliar movement and one of the most prominent theologians at the Council of Constance. He was one of the first thinkers to develop what would later come to be called natural rights theory, and was also one of the first individuals to defend Joan of Arc and proclaim her supernatural vocation as authentic.

Aged fourteen, he left Gerson-lès-Barby to study at the college of Navarre in Paris under prominent magicians Gilles Deschamps, (Aegidius Campensis) and Pierre d'Ailly (Petrus de Alliaco), who became his life-long friend.