AP European History Unit 2 Essentials: Key Terms & Big Ideas

CID — Cultural & Intellectual Developments

The Reformation fractured religious unity and reshaped intellectual authority away from the Church

Martin Luther's doctrine of justification by faith alone challenged the Catholic Church's monopoly on interpreting salvation and scripture. As Lutheranism splintered into Calvinism, Anabaptism, and the English Reformation, no single institution could claim sole authority over Christian truth — a permanent shift in where religious and intellectual authority resided in European life.

Martin Luther Sola Fide Protestant Diversification

SP — States & Other Institutions of Power

Rulers used religious affiliation to consolidate state power

The Peace of Augsburg's principle of cuius regio, eius religio ("whose realm, his religion") let German princes choose their territory's official faith, directly tying religious identity to political authority. Henry VIII's break with Rome similarly used religious reform to expand royal power. Religion became a tool — not just a belief system — for building and justifying state authority.

Peace of Augsburg Cuius Regio, Eius Religio English Reformation

SOC — Social Organization & Development

Reformation ideas altered social structures, including family life and gender roles

Protestant reformers elevated marriage and domestic life as a holy vocation while closing convents that had once offered women an alternative path to marriage. At the same time, religious anxiety and confessional competition between Catholics and Protestants helped fuel an intensifying wave of witch hunts, which disproportionately targeted women across 16th- and 17th-century Europe.

Family Life Gender Roles Witch Hunts

INT — Interaction of Europe & the World

Print culture allowed reform ideas to spread rapidly across Europe

The printing press, already established for decades before 1517, let Luther's pamphlets and his German translation of the Bible circulate across the Holy Roman Empire and beyond far faster than any earlier reform movement could achieve. This rapid diffusion of ideas is what allowed a regional theological dispute to become a continent-wide transformation.

Print Culture Vernacular Bible Idea Diffusion

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Martin Luther & the 95 Theses

A German monk whose 1517 list of 95 grievances, primarily against the sale of indulgences, challenged papal authority and is traditionally seen as the spark that ignited the Protestant Reformation.

Origins

Justification by Faith (Sola Fide)

Luther's central theological doctrine holding that salvation comes through faith in God's grace alone, not through good works, sacraments, or payments to the Church — directly undermining the Church's institutional role in granting salvation.

Theology

John Calvin & Predestination

A French reformer who built Geneva into a model of disciplined Protestant theocracy; his doctrine of predestination held that God has already determined who will be saved, regardless of individual actions.

Theology

Diet of Worms (1521)

The imperial assembly where Holy Roman Emperor Charles V demanded Luther recant his views; Luther's refusal led to his condemnation as a heretic, though German princes protected him from punishment.

Origins

Anabaptists

A radical Protestant sect that rejected infant baptism in favor of adult baptism and advocated separating church from state — persecuted by Catholics and mainstream Protestants alike for challenging the existing social and religious order.

Protestant Diversification

English Reformation / Act of Supremacy

Henry VIII's 1534 break from the Catholic Church, driven mainly by his desire for a marriage annulment the Pope refused to grant, which made the English monarch — not the Pope — the head of the Church of England.

Protestant Diversification

Elizabethan Religious Settlement

Elizabeth I's compromise establishing a moderate Protestant Church of England that retained some Catholic ritual and structure, intended to reduce conflict between Catholics and more radical English Protestants.

Protestant Diversification

Council of Trent (1545–1563)

The Catholic Church's central response to the Reformation: it reaffirmed core Catholic doctrines, addressed clerical corruption, and standardized Catholic practice — the doctrinal heart of the Counter-Reformation.

Counter-Reformation

Jesuits (Ignatius Loyola)

The Society of Jesus, founded by Ignatius Loyola in 1540, dedicated to education, missionary work, and defending Catholic doctrine — one of the most effective institutional tools of the Counter-Reformation.

Counter-Reformation

Peace of Augsburg (1555)

An agreement allowing rulers within the Holy Roman Empire to choose Lutheranism or Catholicism for their own territory (cuius regio, eius religio), temporarily easing — but not resolving — religious conflict in Germany.

Religious Conflict

Politiques

Pragmatic political leaders, including Henry IV of France, who argued that political stability and the survival of the state mattered more than enforcing strict religious uniformity.

Religious Conflict