Pope Leo X: Did you mean...?

Theophilos was emperor of the Byzantine Empire from 829 to 842 CE. He was the second ruler of the Amorion dynasty founded by his father Michael II. Popular during his reign and responsible for a lavish rebuilding of Constantinople's palaces...

As the Protestant Reformation emerged in France in the early 16th century, the city of Meaux became one of the first centers of controversy. Bishop Guillaume Briçonnet II undertook a campaign to reform the Catholic Church from within and...

A 15-16th century manuscript illustration of Pope Joan, a legendary female pope of the Middle Ages said to have reigned from 855 to 858. Her existence is disputed. (Bibliothèque nationale de France).

Constantine V, also known as Constantine the Dung-named by his enemies, was emperor of the Byzantine empire from 741 to 775 CE. He enjoyed military successes in the Middle East and Balkans but his reign is chiefly remembered for his systematic...

The English Reformation began with Henry VIII of England (r. 1509-1547 CE) and continued in stages over the rest of the 16th century CE. The process witnessed the break away from the Catholic Church headed by the Pope in Rome. The Protestant...

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...

John Wycliffe (l. 1330-1384, also John Wyclif) was an English theologian, priest, and scholar, recognized as a forerunner to the Protestant Reformation in Europe. Wycliffe condemned the practices of the medieval Church, citing many of the...

A statue of Pope Urban II (r. 1088-1099 CE) who called for the First Crusade (1095-1202 CE). Clermont-Ferrand, France.

A medieval manuscript illustration showing Pope Innocent III (r. 1198-1216 CE) and the crusaders of the Albigensian Crusade in southern France (1209-1229 CE). (Chronicles of Saint-Denis, British Library, London)

A manuscript depicting Frederick II (l. 1194-1250 CE) being excommunicated by Pope Innocent IV.