114 figures
Church figures
Heretics, defenders, and theologians who shaped Christian doctrine across two millennia.
Heretics(38)
Figures whose teachings were condemned as contrary to orthodox doctrine.
Arius
hereticPresbyter in Alexandria
Nicene Era (4th C)
Pelagius
hereticBritish monk and theologian active in Rome and North Africa
Post-Nicene Patristic (4th-5th C)
Nestorius
hereticArchbishop of Constantinople
Post-Nicene Patristic (4th-5th C)
Valentinus
hereticGnostic teacher and theologian, active in Alexandria and Rome
Early Church (2nd-3rd C)
Aetius of Antioch
hereticDeacon and radical Arian theologian in Antioch and Alexandria
Nicene Era (4th C)
Apollinaris of Laodicea
hereticBishop of Laodicea; friend of Athanasius and defender of Nicaea before his own condemnation
Nicene Era (4th C)
Basilides
hereticGnostic teacher in Alexandria, claimed to transmit secret teaching from the apostle Matthias
Early Church (2nd-3rd C)
Berengar of Tours
hereticArchdeacon of Angers and teacher at Tours; the most prominent Eucharistic controversialist of the 11th century
Medieval (9th-15th C)
Bogomil
hereticBulgarian priest and founder of the Bogomil movement in the First Bulgarian Empire
Medieval (9th-15th C)
Carpocrates
hereticGnostic philosopher in Alexandria, founder of the Carpocratian sect
Early Church (2nd-3rd C)
Cerdon
hereticSyrian Gnostic teacher in Rome, precursor and probable influence on Marcion
Early Church (2nd-3rd C)
Cerinthus
hereticJewish-Christian Gnostic teacher, active in Asia Minor; reportedly a contemporary and opponent of the Apostle John
Apostolic Fathers (1st-2nd C)
Donatus the Great
hereticBishop of Carthage and leader of the Donatist schism in North Africa
Nicene Era (4th C)
Emperor Constantine V
hereticByzantine Emperor; the most aggressive and theologically active of the iconoclast emperors
Late Patristic (5th-8th C)
Emperor Leo III
hereticByzantine Emperor; initiator of the first phase of Byzantine Iconoclasm
Late Patristic (5th-8th C)
Eunomius of Cyzicus
hereticBishop of Cyzicus; leader of the radical Arian (Anomoean) party; the most philosophically sophisticated Arian theologian
Nicene Era (4th C)
Eutyches
hereticArchimandrite (monastic superior) in Constantinople; opposed Nestorianism so strongly he fell into the opposite error
Post-Nicene Patristic (4th-5th C)
Felix of Urgel
hereticBishop of Urgel in the Spanish March; leading proponent of Spanish Adoptionism under Carolingian rule
Medieval (9th-15th C)
Girolamo Savonarola
hereticDominican friar and prophet in Florence; de facto ruler of the Florentine Republic 1494-1498
Reformation (15th-16th C)
Guilhabert de Castres
hereticBishop of Toulouse and leading Cathar perfectus in Languedoc; presided over the great Cathar council at Saint-Félix in 1167
Medieval (9th-15th C)
Hermogenes of Carthage
hereticPainter and theologian in Carthage; opponent of Tertullian
Early Church (2nd-3rd C)
Jan Hus
hereticRector of the University of Prague; Czech reformer and preacher; burned at the Council of Constance
Medieval (9th-15th C)
John Wycliffe
hereticEnglish philosopher and theologian at Oxford; the first major pre-Reformation reformer; translator of the Bible into English
Medieval (9th-15th C)
Jovinian
hereticRoman monk; opponent of ascetic elitism in the Western church
Post-Nicene Patristic (4th-5th C)
Lucifer of Cagliari
hereticBishop of Cagliari in Sardinia; extreme rigorist who refused any reconciliation with bishops who had compromised with Arianism
Nicene Era (4th C)
Macedonius I
hereticBishop of Constantinople; leader of the Semi-Arian Pneumatomachian party
Nicene Era (4th C)
Mani
hereticPersian prophet and founder of Manichaeism; presented himself as the final messenger of God completing the work of Buddha, Zoroaster, and Jesus
Early Church (2nd-3rd C)
Marcellus of Ancyra
hereticBishop of Ancyra; initially an ally of Athanasius against Arianism who was himself condemned for the opposite error
Nicene Era (4th C)
Marcion of Sinope
hereticShip-owner and theologian from Sinope in Pontus; founded the first large-scale alternative Christian church with his own canon of scripture
Early Church (2nd-3rd C)
Meletius of Lycopolis
hereticBishop of Lycopolis in Egypt; rigorist schismatic whose followers clashed with Athanasius for decades
Nicene Era (4th C)
Montanus
hereticFounder of the Montanist movement (New Prophecy) in Phrygia, Asia Minor
Early Church (2nd-3rd C)
Novatian
hereticRoman presbyter and theologian; first significant Latin theologian; rival bishop of Rome after Cornelius
Early Church (2nd-3rd C)
Paul of Samosata
hereticBishop of Antioch and high official ('ducenarius') in the court of Queen Zenobia of Palmyra
Early Church (2nd-3rd C)
Peter Waldo
hereticMerchant of Lyon; founder of the Waldensian movement; translated the Bible into vernacular French
Medieval (9th-15th C)
Priscillian
hereticBishop of Ávila in Spain; first Christian heretic executed by a Christian emperor
Post-Nicene Patristic (4th-5th C)
Sabellius
hereticTheologian in Rome; the most systematic early proponent of Modalist Monarchianism
Early Church (2nd-3rd C)
Simon Magus
hereticSamaritan magician and religious teacher; the original 'simoniast'; regarded by church fathers as the father of all heresies
Apostolic (1st C)
Theodotus of Byzantium
hereticLeather merchant from Byzantium; founder of Dynamic Monarchianism (Adoptionism) in Rome
Early Church (2nd-3rd C)
Defenders(8)
Bishops and scholars who championed orthodox teaching against heterodox challenges.
Athanasius
defenderBishop of Alexandria; principal defender of Nicene orthodoxy against Arianism; exiled five times
Nicene Era (4th C)
Cyprian of Carthage
defenderBishop of Carthage; martyr; the dominant voice on ecclesiology in the 3rd-century Latin church
Early Church (2nd-3rd C)
Cyril of Alexandria
defenderArchbishop of Alexandria; architect of Nestorius's condemnation at the Council of Ephesus
Post-Nicene Patristic (4th-5th C)
Hilary of Poitiers
defenderBishop of Poitiers; principal defender of Nicene orthodoxy in the Western church; exiled to Phrygia by Constantius II
Nicene Era (4th C)
Irenaeus of Lyon
defenderBishop of Lyons; wrote Against Heresies (c. 180 CE), the first systematic refutation of Gnosticism and the foundational work of Christian theology as a discipline
Early Church (2nd-3rd C)
John of Damascus
defenderSyrian monk and theologian at the monastery of Mar Saba; wrote the definitive defense of icon veneration during Byzantine Iconoclasm
Late Patristic (5th-8th C)
Leo the Great
defenderPope of Rome; wrote the Tome of Leo, the decisive Christological document of the Council of Chalcedon
Post-Nicene Patristic (4th-5th C)
Vincent of Lerins
defenderMonk at the monastery of Lerins on the French Riviera; author of the Commonitorium, the foundational text on the development of doctrine
Post-Nicene Patristic (4th-5th C)
Theologians(68)
Influential thinkers whose ideas shaped the development of Christian thought.
Augustine
theologianBishop of Hippo; the most influential theologian in Western Christianity
Post-Nicene Patristic (4th-5th C)
Alphonsus Liguori
theologianItalian bishop, founder of the Redemptorists, Doctor of the Church; patron saint of moral theologians
Modern (17th C+)
Ambrose of Milan
theologianBishop of Milan; mentor of Augustine; the first church leader to successfully assert episcopal authority over an emperor
Post-Nicene Patristic (4th-5th C)
Anselm of Canterbury
theologianArchbishop of Canterbury; founder of Scholastic theology; 'the father of Scholasticism'
Medieval (9th-15th C)
Basil of Caesarea
theologianArchbishop of Caesarea in Cappadocia; one of the three Cappadocian Fathers; a founder of Eastern monasticism
Nicene Era (4th C)
Bede the Venerable
theologianBenedictine monk at Wearmouth-Jarrow in Northumbria; the greatest scholar of the early medieval West; Doctor of the Church
Late Patristic (5th-8th C)
Bernard of Clairvaux
theologianCistercian abbot of Clairvaux; the most influential churchman in 12th-century Europe; Doctor of the Church
Medieval (9th-15th C)
Blaise Pascal
theologianFrench mathematician, physicist, and Christian apologist; Jansenist layman; the most brilliant mind to engage seriously with 17th-century skepticism
Modern (17th C+)
Boethius
theologianRoman senator, philosopher, and theologian under Theodoric the Great; wrote the Consolation of Philosophy while awaiting execution on false treason charges
Late Patristic (5th-8th C)
Bonaventure
theologianFranciscan friar, Minister General of the Franciscan Order, Cardinal Bishop of Albano; Doctor of the Church; a leading theologian at the University of Paris
Medieval (9th-15th C)
C.S. Lewis
theologianOxford and Cambridge literature scholar; Anglican lay theologian; the most widely read Christian apologist of the 20th century
Modern (17th C+)
Cassiodorus
theologianRoman senator and later monk; founder of the Vivarium monastery; saved classical and Christian learning through systematic manuscript copying
Late Patristic (5th-8th C)
Charles Spurgeon
theologianBaptist pastor at the Metropolitan Tabernacle in London; the most popular preacher in 19th-century England; 'the Prince of Preachers'
Modern (17th C+)
Charles Wesley
theologianAnglican clergyman; co-founder of Methodism with his brother John; the most prolific hymn writer in Christian history
Modern (17th C+)
Clement of Alexandria
theologianHead of the Catechetical School of Alexandria; the first major Christian theologian to engage systematically with Greek philosophy
Early Church (2nd-3rd C)
Cyril of Jerusalem
theologianBishop of Jerusalem; exiled three times under Arian emperors; his Catechetical Lectures are the most complete 4th-century guide to Christian initiation
Nicene Era (4th C)
Dietrich Bonhoeffer
theologianGerman Lutheran pastor and theologian; leader of the Confessing Church; executed by the Nazis for participation in the plot against Hitler
Modern (17th C+)
Diodore of Tarsus
theologianBishop of Tarsus; founder of the Antiochene School of biblical interpretation; teacher of John Chrysostom and Theodore of Mopsuestia
Nicene Era (4th C)
Dominic de Guzman
theologianSpanish priest; founder of the Order of Preachers (Dominicans); preached against Catharism in Languedoc
Medieval (9th-15th C)
Duns Scotus
theologianFranciscan friar and philosopher-theologian at Oxford, Paris, and Cologne; 'the Subtle Doctor'; founder of Scotism
Medieval (9th-15th C)
Ephrem the Syrian
theologianDeacon and theologian in Nisibis and Edessa; the greatest Syriac Christian writer; Doctor of the Church
Nicene Era (4th C)
Erasmus of Rotterdam
theologianDutch humanist scholar and Catholic priest; the most celebrated intellectual in Europe in the early 16th century; produced the first printed Greek New Testament
Reformation (15th-16th C)
Francis de Sales
theologianBishop of Geneva; co-founder (with Jane de Chantal) of the Order of the Visitation; Doctor of the Church; patron saint of writers and the deaf
Modern (17th C+)
G.K. Chesterton
theologianEnglish journalist, novelist, poet, and Catholic apologist; converted from Anglicanism to Catholicism in 1922
Modern (17th C+)
George Fox
theologianEnglish itinerant preacher; founder of the Religious Society of Friends (Quakers)
Modern (17th C+)
George Whitefield
theologianAnglican evangelist; the leading preacher of the Great Awakening in Britain and America; Calvinist Methodist
Modern (17th C+)
Gregory I the Great
theologianPope of Rome; the most influential pope of the patristic era; Doctor of the Church; shaped medieval Western Christianity more than any figure after Augustine
Late Patristic (5th-8th C)
Gregory Palamas
theologianArchbishop of Thessaloniki; the principal theologian of Hesychasm; the defining figure of late Byzantine Orthodox theology
Medieval (9th-15th C)
Gregory of Nazianzus
theologianArchbishop of Constantinople; one of the three Cappadocian Fathers; 'Gregory the Theologian'; his orations defined Trinitarian and Christological orthodoxy
Nicene Era (4th C)
Gregory of Nyssa
theologianBishop of Nyssa; one of the three Cappadocian Fathers; the most philosophically sophisticated of the Cappadocians; sometimes called the 'father of Christian mysticism'
Nicene Era (4th C)
Hildegard of Bingen
theologianBenedictine abbess in the Rhineland; visionary, theologian, composer, physician, and preacher; Doctor of the Church
Medieval (9th-15th C)
Hippolytus of Rome
theologianPresbyter in Rome; the first antipope; the most prolific early Christian writer in Greek; martyr
Early Church (2nd-3rd C)
Ignatius of Antioch
theologianBishop of Antioch; the second or third bishop after Peter; martyr; wrote seven letters en route to his execution in Rome
Apostolic Fathers (1st-2nd C)
Ignatius of Loyola
theologianSpanish soldier turned mystic; founder of the Society of Jesus (Jesuits); the central figure of the Catholic Counter-Reformation
Reformation (15th-16th C)
Isidore of Seville
theologianArchbishop of Seville; the last of the Latin Church Fathers; his Etymologiae became the standard reference work of the Middle Ages
Late Patristic (5th-8th C)
Jerome
theologianPriest and biblical scholar; translator of the Latin Vulgate Bible; the most learned biblical scholar of the patristic era; Doctor of the Church
Post-Nicene Patristic (4th-5th C)
Joachim of Fiore
theologianCalabrian abbot and visionary; Cistercian and later founder of his own order; his prophetic reading of history influenced nearly every subsequent reform movement
Medieval (9th-15th C)
John Bunyan
theologianEnglish Nonconformist minister; imprisoned 12 years for unlicensed preaching; author of the most widely read work of Protestant devotional literature
Modern (17th C+)
John Calvin
theologianFrench lawyer turned reformer; pastor and theologian in Geneva; the most systematic theologian of the Protestant Reformation
Reformation (15th-16th C)
John Cassian
theologianMonk, priest, and monastic founder in Gaul; brought Eastern desert monasticism to the Western church; founder of Saint-Victor monastery in Marseille
Post-Nicene Patristic (4th-5th C)
John Chrysostom
theologianArchbishop of Constantinople; the greatest preacher of the early church; 'golden-mouthed'; Doctor of the Church
Post-Nicene Patristic (4th-5th C)
John Knox
theologianScottish reformer; galley slave; minister in Geneva under Calvin; founder of the Scottish Presbyterian church
Reformation (15th-16th C)
John Wesley
theologianAnglican clergyman; founder of Methodism; the most important evangelist in 18th-century Britain
Modern (17th C+)
John of the Cross
theologianSpanish Carmelite friar and mystic; co-reformer of the Carmelite order with Teresa of Ávila; Doctor of the Church
Reformation (15th-16th C)
Jonathan Edwards
theologianCongregational minister in Northampton, Massachusetts; the greatest theologian in American history; a central figure in the Great Awakening
Modern (17th C+)
Justin Martyr
theologianPhilosopher turned Christian apologist; the first major Christian intellectual to engage Greco-Roman philosophy; martyred in Rome under Marcus Aurelius
Early Church (2nd-3rd C)
Karl Barth
theologianSwiss Reformed theologian; the most important Protestant theologian of the 20th century; leader of the Confessing Church in Germany
Modern (17th C+)
Martin Luther
theologianGerman Augustinian friar and professor of theology at Wittenberg; initiator of the Protestant Reformation
Reformation (15th-16th C)
Maximus the Confessor
theologianMonk and theologian in North Africa and Rome; the greatest Eastern theologian of the 7th century; died in exile after having his tongue and hand cut off for opposing Monothelitism
Late Patristic (5th-8th C)
Meister Eckhart
theologianDominican friar and theologian; master of theology at Paris; vicar-general of Bohemia; the greatest German mystic
Medieval (9th-15th C)
Nicholas of Cusa
theologianCardinal, bishop, and philosopher-theologian; one of the greatest minds of the 15th century; a transitional figure between medieval and Renaissance thought
Medieval (9th-15th C)
Origen
theologianHead of the Catechetical School of Alexandria; the most prolific and wide-ranging theologian of the early church; condemned posthumously
Early Church (2nd-3rd C)
Paul of Tarsus
theologianApostle to the Gentiles; author of 13 New Testament letters; the most theologically influential figure in Christian history after Jesus
Apostolic (1st C)
Peter Abelard
theologianFrench philosopher and theologian at Paris; the most controversial academic theologian of the 12th century; lover of Héloïse
Medieval (9th-15th C)
Peter Chrysologus
theologianArchbishop of Ravenna; Doctor of the Church; known for brief, clear sermons on the incarnation and Christian life
Post-Nicene Patristic (4th-5th C)
Philip Melanchthon
theologianGerman humanist and theologian; Luther's closest collaborator; author of the Augsburg Confession; the systematizer of Lutheran theology
Reformation (15th-16th C)
Photius of Constantinople
theologianPatriarch of Constantinople; the central figure of the Photian Schism; the most learned man of the 9th century
Medieval (9th-15th C)
Prosper of Aquitaine
theologianLay theologian in Gaul; the most important defender of Augustine's doctrine of grace after Augustine's death; later secretary to Pope Leo I
Post-Nicene Patristic (4th-5th C)
Pseudo-Dionysius the Areopagite
theologianAnonymous Syrian Christian author writing under the name of Paul's Athenian convert (Acts 17:34); the foundational figure of Christian negative (apophatic) theology
Late Patristic (5th-8th C)
Reinhold Niebuhr
theologianAmerican Protestant theologian and public intellectual; the most influential American theologian of the 20th century
Modern (17th C+)
Robert Bellarmine
theologianItalian Jesuit cardinal; the foremost Catholic polemicist against Protestantism; Doctor of the Church
Reformation (15th-16th C)
Tertullian
theologianNorth African lawyer and theologian; the father of Latin Christian theology; coined the words 'Trinity', 'person', and 'substance' in their theological sense
Early Church (2nd-3rd C)
Theodore of Studion
theologianAbbot of the Stoudios monastery in Constantinople; the principal monastic reformer of Byzantine Christianity; an ally of Patriarch Nikephoros in defending icons
Late Patristic (5th-8th C)
Thomas Aquinas
theologianDominican friar and professor of theology at Paris and Naples; Doctor of the Church; 'the Angelic Doctor'; the most systematic theologian in Christian history
Medieval (9th-15th C)
Thomas a Kempis
theologianAugustinian canon in the Netherlands; author of the most widely read Christian devotional work after the Bible
Medieval (9th-15th C)
Ulrich Zwingli
theologianSwiss reformer in Zürich; the third founder of the Protestant Reformation alongside Luther and Calvin; died in battle
Reformation (15th-16th C)
William Tyndale
theologianEnglish reformer, linguist, and Bible translator; martyred by strangulation and burning for heresy in the Netherlands
Reformation (15th-16th C)
William of Ockham
theologianFranciscan friar and philosopher-theologian at Oxford and Munich; 'the Venerable Inceptor'; founder of Nominalism
Medieval (9th-15th C)