The Early Church (c. 30–313 AD)
This major meeting around 49 AD determined that Gentile converts to Christianity did not have to strictly follow the entire Mosaic Law.
What is the Council of Jerusalem?
This Roman Emperor made Christianity the official state religion of the Roman Empire in 380 AD.
Who is Theodosius I?
This 1054 event marked the official structural and theological split between the Western (Catholic) and Eastern (Orthodox) Churches.
What is the East–West Schism?
This German monk sparked the Protestant Reformation in 1517 by nailing his Ninety-Five Theses to the door of the Wittenberg Castle church.
Who is Martin Luther?
Convened by Pope John XXIII in 1962, this Council aimed to bring the Church into dialogue with the modern world (aggiornamento).
What is the Second Vatican Council (Vatican II)?
Her persistent prayers, tears, and maternal devotion over many years played a pivotal role in the eventual conversion of her son, Augustine.
Who is St. Monica?
Once known as Saul, he underwent a dramatic conversion on the road to Damascus and became the primary missionary to the Gentiles.
Who is St. Paul?
This term refers to a belief, teaching, or doctrine that directly contradicts essential, officially defined Christian truths.
What is a heresy?
Unlike enclosed monks, these "begging" orders—such as the Franciscans and Dominicans—lived directly among urban populations to preach.
What are Mendicant Orders?
This Latin phrase captures the Protestant doctrine that the Bible alone is the ultimate, self-authenticating authority for Christian faith.
What is sola scriptura?
Issued by Pope Leo XIII in 1891, this landmark encyclical addressed the abuses of the Industrial Revolution and formed the baseline of Catholic Social Teaching.
What is Rerum Novarum?
This mystic and doctor of the Church worked alongside St. John of the Cross to reform the Carmelite order, demonstrating how deep spiritual friendships spark renewal.
Who is St. Teresa of Ávila?
This 313 AD decree issued by Emperor Constantine legally tolerated and effectively protected Christianity throughout the Roman Empire.
What is the Edict of Milan?
He wrote the famous spiritual autobiography Confessions and the theological masterpiece The City of God.
Who is St. Augustine of Hippo?
This Dominican friar wrote the Summa Theologiae, masterfully blending Christian theology with Aristotelian philosophy.
Who is St. Thomas Aquinas?
This Ecumenical Council (1545–1563) defined Catholic doctrines, corrected clerical abuses, and responded directly to Protestant critiques.
What is the Council of Trent?
One of the original companions of Ignatius of Loyola, this Jesuit missionary traveled extensively across India and Japan.
Who is St. Francis Xavier?
Along with Francis Xavier, this French priest was one of the very first roommates and co-founders of the Jesuits alongside Ignatius of Loyola.
Who is Peter Faber?
He was the first Roman Emperor to systematically persecute Christians, using them as scapegoats for the Great Fire of Rome in 64 AD.
Who is Nero?
Written around 529 AD, this foundational text for Western monasticism established a balanced daily rhythm of Ora et Labora (Prayer and Work).
What is the Rule of St. Benedict?
This major conflict involved a bitter struggle between the Papacy and secular rulers over who had the right to appoint and invest local bishops.
What is the Lay Investiture Controversy?
This Spanish nobleman founded the Society of Jesus (Jesuits) and authored the Spiritual Exercises to guide personal discernment.
Who is St. Ignatius of Loyola?
This 20th-century American Trappist monk and author of The Seven Storey Mountain became famous for his writings on contemplation and interreligious dialogue.
Who is Thomas Merton?
This early Christian apologist and philosopher wrote extensively to defend the faith to the Roman Emperor, showing how intellectual training can be used to answer God's call.
Who is St. Justin Martyr?
This Apostolic Father and Bishop of Antioch wrote seven letters on his way to martyrdom, framing his death as a way to witness to Christ.
Who is St. Ignatius of Antioch?
This Father of the Church translated the Bible from its original Hebrew and Greek into Latin, creating the text known as the Vulgate.
Who is St. Jerome?
This monastic movement, founded in 910 AD, aimed to free the Church from feudal politics by placing its monasteries directly under papal control.
What is the Cluniac Reform Movement?
This monarch severed ties with Rome and declared himself the Supreme Head of the Church of England after the Pope refused an annulment.
Who is Henry VIII?
This term describes the historic friction where missionaries sought to spread the Gospel while simultaneously navigating or opposing the exploitation of European empires.
What is the tension between evangelization and colonial exploitation?
This bishop of Milan was a master orator whose brilliant sermons and intellectual guidance directly helped dismantle Augustine's doubts about Christianity.
Who is St. Ambrose of Milan?
This emperor launched the first empire-wide persecution in 250 AD, requiring all citizens to possess a certificate (libellus) proving they sacrificed to pagan gods.
Who is Decius?
This 2nd-century Bishop of Lyons fiercely defended orthodox Christianity against Gnosticism in his landmark book Against Heresies.
Who is St. Irenaeus of Lyons?
This corrupt medieval practice involved the buying or selling of spiritual things, privileges, or Church offices for personal gain.
What is simony?
This 14th-century crisis saw Western Christianity fracture into rival factions when multiple men claimed to be the true Pope simultaneously.
What is the Papal Schism (or Western Schism)?
He succeeded Pope John XXIII, successfully guided the Second Vatican Council to its closure in 1965, and directed its worldwide implementation.
Who is Pope Paul VI?
This pair of early Christian martyrs—a noblewoman and her slave—demonstrated radical spiritual friendship and social equality by holding hands as they faced death in the Roman arena.
Who are Saints Perpetua and Felicity?
He unleashed the "Great Persecution" in 303 AD, the most severe attempt by Rome to wipe out Christianity by burning scriptures and destroying churches.
Who is Diocletian?
This title is given to early Christian thinkers and pastors from the 1st to 8th centuries whose writings established core Christian theology and stabilized the post-Roman West.
Who are the Church Fathers (or the Patristic Writers)?
This systemic corruption occurred when medieval popes or bishops appointed their own relatives to powerful, lucrative Church positions regardless of merit.
What is nepotism?
This state-run tribunal was established by King Ferdinand and Queen Isabella to police the religious sincerity of Jewish and Muslim converts.
What is the Spanish Inquisition?
This historic era of rapid urbanization and unregulated labor practices prompted the Church to formally develop its modern social doctrines on worker rights.
What is the Industrial Revolution?
These early ascetic Christian hermits fled to the Egyptian wilderness to live radical lives of prayer, profoundly influencing the development of structured communal monasticism.
Who are the Desert Fathers (and Mothers)?