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What Jesus established

The Gospels present Jesus gathering disciples, choosing twelve, giving them authority, and commissioning them to teach. This lesson looks at what the texts say and where interpretations differ.

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Matthew 16:18 and the role of Peter

The single most discussed verse in debates about Church structure, read with its Greek and Aramaic background and with the main competing interpretations set side by side.

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Matthew 18:17, Matthew 28:19–20 and Church authority

Two passages in Matthew show a community able to judge disputes and a commission to teach all nations. Together they describe authority that is both disciplinary and doctrinal.

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Apostolic succession and early Church leadership

How leadership passed from the apostles to bishops, and what the earliest surviving documents actually say about it.

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Acts 15 and the Council of Jerusalem

The first recorded assembly of the Church shows apostles and elders deliberating a doctrinal question and issuing a decision for other communities.

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515 BC – AD 70 — Second Temple Judaism

After the return from Babylon the Temple was rebuilt and Jewish life was shaped by synagogue worship, scriptural study and messianic expectation. The Greek translation of the Hebrew Scriptures, the Septuagint, spread through the diaspora from the third century BC.

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c. AD 27–30 — The public ministry, death and resurrection of Jesus

Jesus preached the kingdom of God, gathered disciples, appointed twelve, and was crucified in Jerusalem under the prefect Pontius Pilate. His followers proclaimed that he rose from the dead.

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c. AD 30–33 — Pentecost and the Jerusalem community

Acts describes the descent of the Holy Spirit on the disciples, Peter's public preaching, and the formation of a community marked by teaching, prayer, the breaking of bread and shared possessions.

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c. AD 49 — The Council of Jerusalem

The apostles and elders decided that Gentile converts were not bound to circumcision and the full Mosaic law, and sent their decision in a letter.

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AD 64–68 — The persecution under Nero

After the fire of Rome in AD 64 Nero punished Christians in the city, as Tacitus records. Early Christian tradition, already attested by Clement of Rome around AD 96, associates the martyrdoms of Peter and Paul with this era.

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AD 70 — The destruction of the Temple

Roman forces under Titus captured Jerusalem and destroyed the Temple at the end of the First Jewish–Roman War.

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c. AD 96 — The Letter of Clement of Rome to Corinth

The Roman church intervened in a dispute at Corinth where presbyters had been deposed, urging their restoration and describing an ordered succession of ministers appointed by the apostles.

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c. AD 107 — The letters and martyrdom of Ignatius of Antioch

On his way to execution in Rome Ignatius wrote seven letters urging unity around the bishop, presbyters and deacons, and affirming the reality of Christ's body in the Eucharist.

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c. AD 155 — Justin Martyr describes Sunday worship

In his First Apology Justin gives a detailed account of Christian Sunday assembly: readings, a sermon, prayers, the kiss of peace, the offering of bread and wine, thanksgiving, communion, and collection for the poor.

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c. AD 180 — Irenaeus writes Against Heresies

Irenaeus refuted Gnostic systems by appealing to the public teaching of churches founded by apostles and to their lists of bishops, and defended the four Gospels as a fixed set.

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AD 303–311 — The Diocletianic persecution

Edicts ordered the destruction of churches and Scriptures, the arrest of clergy and universal sacrifice. It ended with Galerius's edict of toleration in 311.

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AD 313 — The Edict of Milan

Constantine and Licinius agreed to grant religious liberty throughout the empire and to restore confiscated Christian property.

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AD 325 — The First Council of Nicaea

The council rejected Arius's teaching that the Son was a creature, professed the Son “consubstantial” with the Father, and set a common method for dating Easter.

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3rd–6th centuries — The rise of monasticism

Christians withdrew to the Egyptian desert for ascetic life; Pachomius organised communal monasteries, Basil wrote rules for the East, and Benedict's Rule (c. 530) shaped Western monasticism.

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AD 381 — The First Council of Constantinople

The council reaffirmed Nicaea, expanded the creed's article on the Holy Spirit, and condemned remaining Arian and Macedonian positions.

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AD 382, 393, 397, 419 — Regional councils list the biblical canon

The Council of Hippo (393) and the Councils of Carthage (397, 419) listed the books of Scripture, matching the canon later defined at Trent; a list associated with a Roman synod under Damasus (382) is similar.

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AD 431 — The Council of Ephesus

The council condemned Nestorius and affirmed that Mary may be called Theotokos, God-bearer, because the one born of her is the incarnate Word.

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AD 451 — The Council of Chalcedon

The council defined that Christ is one person in two natures, divine and human, without confusion, change, division or separation.

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AD 590–604 — The pontificate of Gregory the Great

Gregory reorganised the Roman church's administration and charity, wrote the Pastoral Rule, and sent a mission to the Anglo-Saxons in 596.

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AD 1054 — The East–West Schism

Papal legates and the patriarch exchanged excommunications. The underlying disputes concerned papal authority, the Filioque addition to the creed, liturgical usage and long political estrangement.

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AD 1095–1291 — The Crusades

Urban II called the First Crusade at Clermont in 1095. Campaigns over two centuries captured and lost Jerusalem, established Latin states, and included the sack of Constantinople by crusaders in 1204.

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AD 1517–1600s — The Protestant Reformation

Luther's Ninety-Five Theses (1517) protested indulgence preaching; disputes over justification, authority and the sacraments led to separate Lutheran, Reformed, Anglican and Anabaptist bodies.

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AD 1545–1563 — The Council of Trent

Over twenty-five sessions Trent defined the canon of Scripture, taught justification, reaffirmed seven sacraments, and enacted reforms including seminaries for training clergy.

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16th–18th centuries — Global Catholic missions

Missionary orders spread Christianity worldwide. Missions were entangled with colonial power; figures such as Las Casas argued forcefully against the enslavement and abuse of indigenous peoples.

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AD 1869–1870 — The First Vatican Council

The council taught on faith and reason and defined papal primacy of jurisdiction and papal infallibility within strict conditions. It was suspended when Italian troops entered Rome.

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AD 1962–1965 — The Second Vatican Council

The council issued sixteen documents on the liturgy, the Church, revelation, the Church in the modern world, ecumenism and religious liberty.

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1965–present — The Church since the Council

Post-conciliar decades brought liturgical reform, the 1983 Code of Canon Law, the 1992 Catechism, rapid growth in Africa and Asia, and the abuse crisis with its ongoing reckoning.

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167–160 BC — The Maccabean revolt

A priestly family led an armed resistance that recovered and rededicated the Temple, an event still kept as Hanukkah.

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c. AD 30–33 — Pentecost and the first Christian community

At the Jewish feast of Weeks the disciples proclaimed the risen Jesus publicly; Acts records baptisms, common prayer, the breaking of bread and shared goods.

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c. AD 46–58 — The missionary journeys of Paul

Paul founded urban communities around the Aegean and wrote letters to them; several of these letters are the earliest Christian documents we possess.

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AD 70 — The destruction of the Temple

Roman forces took Jerusalem and burned the Temple; the Christian community is reported by Eusebius to have withdrawn to Pella.

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c. AD 112 — Pliny's letter to Trajan on the Christians

Pliny reported that Christians met before dawn, sang a hymn to Christ 'as to a god', and bound themselves by oath not to commit theft, adultery or fraud. Trajan replied that they should not be sought out but must be punished if denounced and unrepentant.

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AD 144 — Marcion and the first canon list

Marcion rejected the Old Testament and its God and published a shortened Luke with ten Pauline letters. The Roman church expelled him.

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c. AD 170–200 — The Muratorian Fragment

A damaged Latin list naming books read in church, including four Gospels, Acts and thirteen Pauline letters, while disputing others.

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AD 250–251 — The Decian persecution and the lapsed

Many Christians complied; bishops including Fabian were killed. Afterwards the Church argued over whether those who lapsed could be readmitted.

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c. AD 270–356 — Antony and the desert monks

Christians withdrew to the Egyptian desert for prayer and asceticism; Pachomius organised the first communal monasteries, and Athanasius's Life of Antony spread the ideal westward.

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AD 313 — The Edict of Milan

The emperors granted freedom of worship to Christians and ordered confiscated property returned.

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AD 382 — The Roman synod under Damasus and the Latin canon

A Roman synod issued a list of scriptural books, and Damasus commissioned Jerome to produce a reliable Latin text.

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5th century — The mission to Ireland

Christianity spread through Ireland without martyrdoms or imperial backing, producing a strongly monastic church.

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AD 863 — Cyril and Methodius among the Slavs

They devised an alphabet for Slavonic, translated the Bible and liturgy, and obtained papal approval for worship in the Slavonic tongue.

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AD 910 onwards — The Cluniac reform

A monastery founded free of lay control spread reform through hundreds of houses, emphasising solemn liturgy and independence from local lords.

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AD 1075–1122 — The Gregorian reform and the investiture controversy

Gregory VII forbade lay investiture; Henry IV resisted and was excommunicated, submitting at Canossa in 1077. The Concordat of Worms settled the dispute in 1122.

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AD 1209–1216 — Francis, Dominic and the mendicant orders

New orders lived by poverty and preaching in the growing towns rather than in rural monasteries; Dominicans committed themselves to study and preaching, Franciscans to poverty and mission.

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AD 1265–1274 — Thomas Aquinas and the Summa Theologiae

Aquinas integrated Aristotelian philosophy with Christian theology in a systematic work left unfinished at his death.

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AD 1309–1377 — The Avignon papacy

Seven popes resided in Avignon under strong French influence until Gregory XI returned to Rome, urged among others by Catherine of Siena.

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AD 1534–1600 — The Catholic Reformation and the Jesuits

New orders, reformed bishops, seminaries and a wave of mysticism renewed Catholic life alongside the decrees of Trent.

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16th century — Evangelisation and conquest in the Americas

Millions were baptised; Dominicans such as Montesinos and Las Casas denounced the enslavement of indigenous people, and Paul III's bull Sublimis Deus (1537) declared them rational and not to be enslaved.

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AD 1891 — Rerum Novarum and Catholic social teaching

Leo XIII defended a just wage, the right to form unions, private property and the duties of employers.

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AD 1929 — The Lateran Treaty and Vatican City

An agreement recognised the sovereignty of Vatican City, the smallest state in the world.

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AD 1965 — Nostra Aetate and relations with the Jewish people

Vatican II rejected the charge of collective Jewish guilt for the death of Christ and condemned antisemitism.

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AD 2002 onwards — The clerical abuse crisis and Church response

Norms were tightened, mandatory reporting introduced in many countries, a papal commission for the protection of minors created in 2014, and Vos Estis Lux Mundi issued in 2019 to hold bishops accountable.

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AD 2013–2025 — Francis, synodality and the election of Leo XIV

Francis, the first Latin American pope, emphasised mercy, care for migrants and the environment, and convened a Synod on Synodality (2021–2024). After his death in April 2025 the conclave elected Robert Prevost, who took the name Leo XIV, the first pope born in the United States.

Fathers

Clement of Rome

Author of the earliest datable Christian writing outside the New Testament, a letter from the Roman church to Corinth written about AD 96.

Fathers

Ignatius of Antioch

His seven authentic letters, written while under guard on the way to execution, are the earliest clear witness to bishops, presbyters and deacons as distinct ministries.

Fathers

Polycarp of Smyrna

Irenaeus states that Polycarp was taught by the apostle John, providing a personal link between the apostolic generation and the later second century.

Fathers

Justin Martyr

The first major Christian apologist to address the emperor directly, and the earliest source describing the full shape of Sunday worship.

Fathers

Irenaeus of Lyons

His five-book refutation of Gnosticism set out the argument from apostolic succession and defended the fourfold Gospel.

Fathers

Tertullian

The first major Latin Christian author; he shaped Western theological vocabulary, including the word trinitas.

Fathers

Origen of Alexandria

The most prolific scholar of the early Church; he produced the Hexapla, a six-column comparison of Old Testament texts, and wrote commentaries on most of Scripture.

Fathers

Cyprian of Carthage

His letters and treatises are a primary source for third-century Church discipline, the readmission of the lapsed, and relations between African bishops and Rome.

Fathers

Athanasius of Alexandria

The central defender of Nicene faith through decades of exile; his Festal Letter of 367 lists the twenty-seven books of the New Testament exactly as received today.

Fathers

Basil the Great

One of the Cappadocian Fathers whose work on the Holy Spirit prepared the definitions of Constantinople I; he also founded a large complex of hospitals and hostels.

Fathers

Gregory of Nazianzus

His Five Theological Orations, delivered at Constantinople, gave classic expression to Trinitarian doctrine shortly before the council of 381.

Fathers

John Chrysostom

The greatest preacher of the early Church, whose surviving homilies are a major source for the biblical interpretation, liturgy and social conditions of his time.

Fathers

Jerome

Translator of the Latin Vulgate, largely from Hebrew, which became the standard Bible of the Western Church for a thousand years.

Fathers

Augustine of Hippo

The most influential theologian of the Latin West, decisive for later Catholic and Protestant thought on grace, sin, the Church and history.

Fathers

Papias of Hierapolis

He is the earliest named source for the origins of the Gospels of Mark and Matthew.

Fathers

Aristides of Athens

One of the earliest Christian apologies and a rare description of Christian ethics from outside official Church documents.

Fathers

Hippolytus of Rome

The Apostolic Tradition attributed to him preserves one of the oldest surviving eucharistic prayers and ordination rites.

Fathers

Eusebius of Caesarea

Without him we would know very little about the first three centuries of Christianity.

Fathers

Ephrem the Syrian

The greatest Syriac writer, and evidence that early Christian theology was not only Greek and Latin.

Fathers

Basil the Great

One of the three Cappadocian Fathers whose language made the definition of 381 possible; a founder of organised Christian charity.

Fathers

Gregory of Nazianzus

His orations gave the doctrine of the Trinity its classical expression in Greek.

Fathers

John Chrysostom

The most extensive body of patristic biblical preaching that survives, and a model of pastoral courage.

Fathers

Jerome

His Vulgate was the Bible of western Europe for more than a thousand years.

Fathers

Ambrose of Milan

He set an early precedent for the moral independence of the Church from the state.

Fathers

Cyril of Jerusalem

His lectures are the clearest surviving description of fourth-century Christian initiation.

Fathers

Leo the Great

The clearest early articulation of the Roman bishop's teaching role, and a decisive voice in christology.

Fathers

Benedict of Nursia

Benedictine monasteries preserved literacy, agriculture and libraries through the collapse of Roman order in the West.

Fathers

Gregory the Great

He shaped the medieval papacy, western liturgy and the pastoral ideal of the bishop as 'servant of the servants of God'.

Fathers

John of Damascus

His On the Orthodox Faith is the first great systematic summary of Greek theology and shaped Nicaea II.

Councils

Council of Jerusalem (c. AD 49)

Whether Gentile converts had to be circumcised and keep the Mosaic law.

Councils

First Council of Nicaea (AD 325)

The teaching of the Alexandrian presbyter Arius that the Son was created and not eternal.

Councils

First Council of Constantinople (AD 381)

Continuing Arian disputes and denial of the divinity of the Holy Spirit.

Councils

Council of Ephesus (AD 431)

Nestorius's objection to calling Mary Theotokos and the questions about Christ's unity that it raised.

Councils

Council of Chalcedon (AD 451)

The teaching that Christ had only one nature after the incarnation, and the disputed council of 449.

Councils

Second Council of Nicaea (AD 787)

The iconoclast controversy over the veneration of images.

Councils

Council of Trent (AD 1545–1563)

The Protestant Reformation and long-standing calls for reform of Church discipline.

Councils

First Vatican Council (AD 1869–1870)

Rationalism, the loss of the Papal States and questions about the pope's teaching authority.

Councils

Second Vatican Council (AD 1962–1965)

A pastoral council intended to present the faith to the modern world.

Councils

Synod of Elvira (c. AD 300–306)

To regulate Christian life in Spain in the years around the last great persecution.

Councils

Council of Arles (AD 314)

The Donatist schism in North Africa and the validity of sacraments administered by clergy who had lapsed.

Councils

Synods of Hippo and Carthage (AD 393, 397 and 419)

African bishops sought a settled list of books to be read as Scripture in the liturgy.

Councils

Second Council of Orange (AD 529)

The long dispute over grace and free will that followed Augustine and the so-called Semi-Pelagians.

Councils

Second Council of Constantinople (AD 553)

The dispute over the 'Three Chapters' and continued resistance to Chalcedon in the East.

Councils

Third Council of Constantinople (AD 680–681)

Monothelitism, the teaching that Christ has only one will.

Councils

Fourth Council of Constantinople (AD 869–870)

The contested depositions of the patriarchs Ignatios and Photios.

Councils

Fourth Lateran Council (AD 1215)

Reform of clergy and laity, the Albigensian and Waldensian movements, and preparations for a crusade.

Councils

Second Council of Lyons (AD 1274)

Reunion with the Greek Church, reform, and aid for the Holy Land.

Councils

Council of Constance (AD 1414–1418)

Three rival claimants to the papacy during the Western Schism, and the teachings of Wyclif and Hus.

Councils

Council of Basel–Ferrara–Florence (AD 1431–1445)

Conciliarism, and a final attempt at union with the East as Constantinople faced Ottoman conquest.

Papacy

Saint Peter (d. c. AD 64–68)

Catholic teaching sees in him the first of an unbroken line of Roman bishops; historians agree he was martyred in Rome but debate whether he held an office resembling later papal authority.

Papacy

Clement I (c. AD 88–99)

The earliest surviving instance of a Roman bishop intervening in another church's affairs, and a key text on apostolic succession.

Papacy

Victor I (c. AD 189–199)

Both sides of later debates on Roman primacy cite this episode: Victor claimed wide authority, but other bishops felt free to resist him.

Papacy

Silvester I (AD 314–335)

The medieval 'Donation of Constantine', which claimed he received temporal power, was proved a forgery by Lorenzo Valla in 1440.

Papacy

Damasus I (AD 366–384)

He did more than any pope to establish Latin as the language of western Christianity.

Papacy

Leo I, the Great (AD 440–461)

He articulated the doctrine that the bishop of Rome acts as heir to Peter's commission.

Papacy

Gregory I, the Great (AD 590–604)

He is regarded as the founder of the medieval papacy and adopted the title 'servant of the servants of God'.

Papacy

Nicholas I (AD 858–867)

He asserted papal authority over kings and eastern patriarchs more strongly than any predecessor.

Papacy

Gregory VII (AD 1073–1085)

His reform freed episcopal appointments from lay control and defined papal claims for centuries.

Papacy

Innocent III (AD 1198–1216)

The most powerful medieval pope; the sack of Constantinople during his pontificate deepened the East–West breach, and John Paul II expressed sorrow for it in 2001.

Papacy

Paul III (AD 1534–1549)

He launched the institutional Catholic Reformation, though he also practised the nepotism it aimed to end.

Papacy

Pius V (AD 1566–1572)

His missal shaped Catholic worship until 1970; the excommunication of Elizabeth worsened the position of English Catholics.

Papacy

Pius IX (AD 1846–1878)

He turned the papacy into a spiritual rather than territorial power, while his condemnations of liberalism remain contested.

Papacy

Leo XIII (AD 1878–1903)

He created modern Catholic social teaching and reconciled the Church with historical scholarship.

Papacy

Pius X (AD 1903–1914)

His sacramental reforms endure; the anti-Modernist campaign, including the secret Sodalitium Pianum, is widely judged to have harmed Catholic scholarship.

Papacy

Pius XII (AD 1939–1958)

Historians continue to debate whether his wartime public silence about the extermination of the Jews was prudence that saved lives or a moral failure; Vatican archives for his pontificate opened in 2020.

Papacy

John XXIII (AD 1958–1963)

He reoriented the Church toward dialogue with the modern world; canonised in 2014.

Papacy

Paul VI (AD 1963–1978)

He carried out the largest liturgical reform in Catholic history; Humanae Vitae provoked widespread dissent that still shapes Catholic debate.

Papacy

John Paul II (AD 1978–2005)

One of the most consequential pontificates in modern history; critics note that responses to clerical abuse were inadequate during these years.

Papacy

Benedict XVI (AD 2005–2013)

The first pope to resign freely since 1294; he tightened canonical procedures against abuse while facing criticism over earlier handling of cases.

Papacy

Francis (AD 2013–2025)

He reframed Catholic priorities around mercy and the poor; his reforms were welcomed by many and resisted by others.

Papacy

Leo XIV (AD 2025–)

He explained his name as a reference to Leo XIII and the social question raised anew by artificial intelligence and industrial change.