Cologne War

The Cologne War (1583–1588) was a conflict in the Electorate of Cologne after Archbishop-Elector Gebhard Truchsess von Waldburg converted to Protestantism and sought to retain his office.

Gebhard Truchsess von Waldburg: The archbishop-elector of Cologne who converted to Protestantism and tried to retain his electoral territory. His conversion and refusal to resign triggered the conflict.
Protestant Reformation: A sixteenth-century movement that challenged Roman Catholic doctrine and authority and established Protestant churches. Its spread made a Protestant ruler in Cologne politically consequential.
Hermann von Wied: The archbishop-elector of Cologne who attempted religious reform in the 1540s before being forced from office. His earlier reform effort foreshadowed the conflict over a Protestant Cologne.
Catholic Reformation: The renewal of Catholic institutions, doctrine, and religious practice during the sixteenth and seventeenth centuries. The victory at Cologne reinforced Catholic institutional recovery in the empire.
Ernest of Bavaria: A Catholic prince who became archbishop-elector of Cologne during the war. His election gave Catholic forces a rival claimant to Gebhard’s office.
Archbishopric of Cologne: An ecclesiastical principality of the Holy Roman Empire ruled by the archbishop of Cologne. Its ruler held both church office and territorial power.
Pope Gregory XIII: The pope from 1572 to 1585, whose pontificate supported Catholic reform and the Catholic cause in Europe. The papacy backed the Catholic effort to prevent Cologne’s conversion.
Bavarian Circle: An administrative and military district of the Holy Roman Empire that included Bavaria and several ecclesiastical territories. Bavarian power in the circle helped sustain Catholic influence around Cologne.
Ecclesiastical Reservation: A provision of the 1555 Peace of Augsburg requiring ecclesiastical rulers who converted to resign their offices and territories. The dispute centered on whether Gebhard was bound by this provision.
Electorate of Cologne: An electorate of the Holy Roman Empire whose archbishop ranked among the prince-electors. The war threatened the religious and political balance of an electoral territory.

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