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Pope Gregory I
Statue of St. Gregory the Great in the Oratory of St. Barbara on the Caelian Hill, Rome.

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Council of Clermont
The Council of Clermont in central France was held in November 1095 and witnessed Pope Urban II's (r. 1088-1099) historic call for the First Crusade (1095-1102) to capture Jerusalem for Christendom from its Muslim occupiers. The Pope's speech...

Definition
Donation of Constantine
The Donation of Constantine (Donatio Constantini or the Donatio) is a medieval forgery dated to the 8th century purporting to be an original 4th-century document in which the Roman emperor Constantine the Great (r. 306-337) granted supreme...

Definition
Diet of Worms
The Diet of Worms (January-May 1521) was the assembly convened by Charles V, Holy Roman Emperor to address, among other issues, the works of the reformer Martin Luther (l. 1483-1546) who openly criticized the Church. Luther was told to recant...

Article
Unam Sanctam: Spiritual Authority & the Medieval Church
The Unam Sanctam (1302) was a papal bull issued by Pope Boniface VIII (served 1294-1303) requiring the complete submission of all people, including kings, to the authority and dictates of the pope. As the Church was understood as holding...

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Doctrine of Discovery: What Is It and Why is Pope Francis Being Asked to Denounce It?
Pope Francis is facing calls to rescind a centuries-old policy called the ‘Doctrine of Discovery,’ stemming from a series of edicts, known as papal bulls, dating back to the 15th century, which states that white European nations "discovered"...

Definition
Leo Africanus
Leo Africanus (al-Hasan ibn Muhammad ibn Ahmad al-Wazzan al-Fasi al-Granati, 1485-1554) was a diplomat, merchant traveller and scholar who famously voyaged from Timbuktu to the Niger River and wrote 'The Description of Africa' (La Descrittione...

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Henry VIII of England
Henry VIII of England ruled as king from 1509 to 1547. The second Tudor king after his father Henry VII of England (r. 1485-1509), Henry had inherited a kingdom which enjoyed both unity and sound finances. Famous for his six wives as he searched...

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Thomas Aquinas
Saint Thomas Aquinas (l. 1225-1274, also known as the "Ox of Sicily" and the "Angelic Doctor") was a Dominican friar, mystic, theologian, and philosopher, all at once. Although he lived a relatively short life, dying at age 49, Thomas occupied...

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Saint Cyril
Saint Cyril (aka Kyrillos and Constantine the Philosopher, d. 867 CE) was a Byzantine linguist, teacher, scholar and missionary who famously preached Christianity to the Slavs in Moravia with his brother Methodius during the 9th century CE...