Medieval Popes

What Counts as the Medieval Papacy

This page surveys the period from St. Gregory the Great through the end of the Great Western Schism in AD 1417. The boundaries are interpretive rather than dogmatic.

The period includes the evangelization of Europe, Islamic expansion, Carolingian alliance, feudal fragmentation, reform movements, East-West estrangement, Crusades, universities, canon law, mendicant orders, Avignon, and schism.

The papacy was simultaneously a spiritual office, landholder, court, judge, diplomatic power, and protector of Roman society.

After the Western Empire

With imperial structures weakened, popes often assumed civic tasks involving food, defense, negotiation, property, and care for refugees. The Lombards threatened Rome while Byzantine authority remained distant and unstable.

This practical responsibility increased the temporal dimension of the papacy. It also created long-term entanglements between spiritual mission and territorial rule.

Missionary Expansion

Gregory the Great sent Augustine to the English. Later popes supported missions among Germanic and Slavic peoples, reformed local churches, and connected new Christian kingdoms with Rome.

St. Boniface worked closely with the papacy in reforming the Frankish Church. Saints Cyril and Methodius received Roman support for mission and Slavonic liturgy amid tensions between East and West.

Mission was never simply cultural expansion; it also became entangled with royal power and conquest.

The Carolingian Alliance and Papal States

As Byzantine protection failed, the popes turned increasingly toward the Franks. Pope Stephen II’s alliance with Pepin and the Donation of Pepin strengthened papal temporal territory.

Pope St. Leo III crowned Charlemagne emperor in AD 800, creating a powerful but contested relationship between papal and imperial authority.

The Papal States protected independence in some periods while exposing the Church to warfare, dynastic pressure, taxation, and territorial ambition.

Roman Factions and the Tenth-Century Crisis

During parts of the ninth and tenth centuries, Roman noble families and rulers manipulated papal elections. Some popes were violent, immoral, or politically dependent.

This period must not be sensationalized into the claim that the entire Church lost apostolic continuity. It does show the grave damage caused when election and governance become captive to local power.

Reform arose through monasteries, bishops, emperors, clergy, and later popes.

The Gregorian Reform

Eleventh-century reformers opposed simony, clerical sexual disorder, lay control of ecclesiastical office, and corrupt elections. Popes including St. Leo IX, Nicholas II, St. Gregory VII, and Urban II pursued institutional and moral renewal.

The 1059 election decree gave the cardinal bishops a leading role in papal selection, reducing direct control by Roman factions and emperors.

Reform strengthened papal governance and the ideal of clerical freedom, but polemical methods and centralization also generated conflict.

The East-West Schism

The division between Rome and Constantinople developed through language, culture, politics, jurisdiction, liturgical differences, and doctrinal disputes. The mutual excommunications of AD 1054 became a symbol rather than a complete single cause.

The Fourth Crusade’s sack of Constantinople in AD 1204 inflicted a catastrophic wound. Later reunion councils failed to produce stable reception.

The medieval papacy must be judged both for preserving claims it believed apostolic and for failures that deepened estrangement.

Investiture and the Freedom of the Church

The Investiture Controversy concerned whether secular rulers could invest bishops with the symbols of spiritual office. Gregory VII and Emperor Henry IV became central figures.

The conflict included excommunication, political rebellion, dramatic penance at Canossa, renewed warfare, and contested claims.

The Concordat of Worms in AD 1122 distinguished spiritual investiture from temporal rights and provided a negotiated settlement.

The Crusades

Pope Urban II called the First Crusade in AD 1095 amid appeals from the East and concern for pilgrims and holy places. Crusading joined pilgrimage, warfare, penance, politics, and territorial ambition.

Some participants acted with courage and sacrifice; others committed atrocities against Jews, Eastern Christians, Muslims, and local populations.

The spiritual goals and legal theories of crusade do not excuse crimes, and later romanticism must not conceal victims.

Canon Law and Papal Justice

The medieval centuries saw the systematic development of canon law, especially after Gratian’s Decretum. Papal decretals, courts, legates, and appeals created a more integrated legal order.

The system could protect rights, regulate marriage, discipline clergy, resolve disputes, and restrain local abuses. It could also become slow, expensive, centralized, and vulnerable to patronage.

Modern canon law owes much to this period while not preserving every medieval procedure.

Innocent III and the High Medieval Papacy

Innocent III exercised broad spiritual and political influence, summoned the Fourth Lateran Council, promoted reform, addressed heresy, and intervened in royal disputes.

Lateran IV defined and regulated major areas of doctrine, Sacraments, preaching, clerical life, marriage, and discipline.

The same pontificate is connected with coercive policies and the tragic Fourth Crusade. Historical assessment must hold achievements and grave failures together.

Mendicants, Universities, and New Spiritual Movements

The popes approved and supported new forms of religious life associated with St. Francis, St. Dominic, and other movements. Mendicants renewed preaching, poverty, study, mission, and urban ministry.

Universities and scholastic theology developed within ecclesial structures. Papal privileges sometimes protected scholars and orders from local interference.

Tensions over poverty, authority, inquisitorial procedure, and theological schools also required judgment.

Avignon and the Great Western Schism

From 1309 the popes resided at Avignon for several decades. The administration became effective in some respects but was perceived as entangled with French influence and financial centralization.

Gregory XI returned to Rome, but his death in 1378 was followed by rival elections and obediences. At points, multiple claimants divided kingdoms, dioceses, religious orders, and saints.

The Council of Constance ended the schism through resignations, deposition of claimants, and election of Martin V in 1417. Conciliarist theories claiming a council’s ordinary superiority over the pope were not accepted as Catholic doctrine.

Medieval Legacy

• Evangelization and consolidation of European churches.
• Development of papal elections and the College of Cardinals.
• Growth of canon law, appeals, and curial administration.
• Defense of ecclesial freedom from secular domination.
• Support for councils, universities, missions, and religious orders.
• Political entanglement, warfare, coercion, and financial abuses.
• Deepening division with Eastern Christianity.
• A historical record requiring gratitude, repentance, and careful distinction.

Common Misconceptions

“The Middle Ages were one unchanging papal system”

The period spans more than eight centuries and includes radically different political and ecclesial conditions.

“Every papal political claim was dogma”

Many claims concerned contested legal and prudential questions rather than irreformable faith.

“The Crusades can be judged only as holy or only as evil”

Their causes, intentions, laws, participants, and crimes require careful moral and historical distinction.

“The Great Western Schism produced multiple true popes”

The crisis involved rival claimants; the Church ultimately recognized one legitimate succession.

“Conciliarism became Catholic doctrine at Constance”

The council healed the schism, but theories making councils ordinarily superior to the pope were not received as doctrine.

Key Takeaways

• Medieval papal history cannot be separated from feudal and imperial politics.
• Reform movements sought freedom from simony, corruption, and lay domination.
• Canon law and papal justice became major institutions.
• Crusades and coercive actions require moral honesty about victims.
• The Avignon period and Western Schism exposed the danger of politicized elections.
• The period’s spiritual achievements and institutional failures must be studied together.

Related CatholicG33k Resources

Prayer

Lord of history, receive the good accomplished through the medieval Church and forgive the sins committed by her members.

Through the saints, reformers, missionaries, and victims of these centuries, teach us courage, repentance, justice, and fidelity.

Amen.

Selected Sources and Further Reading

• St. Gregory the Great, letters and Pastoral Rule.
• Documents of Lateran I–IV, Lyons I–II, Vienne, and Constance.
• Papal election decree of Nicholas II.
• Dictatus Papae and letters of Gregory VII, interpreted in historical context.
• Concordat of Worms.
• Urban II, accounts of the Council of Clermont, used critically.
• Gratian, Decretum, and medieval papal decretals.
• St. Bernard of Clairvaux, writings to popes and crusaders.
• St. Catherine of Siena, letters concerning Avignon and reform.
• William J. La Due, The Chair of Saint Peter.
• Rupert Matthews, The Popes: Every Question Answered.
• Catholic Encyclopedia, articles on medieval popes, councils, elections, and the Western Schism.