Heresy: Did you mean...?

Constantine I (Flavius Valerius Constantinus) was Roman emperor from 306-337 CE and is known to history as Constantine the Great for his conversion to Christianity in 312 CE and his subsequent Christianization...

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...

Joan of Arc (Jeanne D'Arc, l. c. 1412-1431 CE) was a medieval peasant who, claiming to receive visions from God, turned the tide of the Hundred Years' War in favor of a French victory. She was famously martyrd for standing by her...

Claudius Ptolemy (c. 100 to c. 170 CE) was an Alexandrian mathematician, astronomer, and geographer. His works survived antiquity and the Middle Ages intact, and his theories, particularly on a geocentric model of the universe...

Zoroastrianism is the monotheistic faith established by the Persian prophet Zoroaster (also given as Zarathustra, Zartosht) between c. 1500-1000 BCE. It holds that there is one supreme deity, Ahura Mazda (Lord of Wisdom), creator...

King Arthur is among the most famous literary characters of all time. The Arthurian legend of the Knights of the Round Table, Camelot, the Quest for the Holy Grail, the love affair of Lancelot and Guinevere, and the wizard Merlin...

The Cathars (also known as Cathari from the Greek Katharoi for “pure ones”) were a dualist medieval religious sect of Southern France which flourished in the 12th century and challenged the authority of the Catholic Church. They were...

The Council of Trent (1545-1563) was a meeting of Catholic clerics convened by Pope Paul III (served 1534-1549) in response to the Protestant Reformation. In three separate sessions, the council reaffirmed the authority of the...

Henry V of England ruled as king from 1413 to 1422. Succeeding his father Henry IV of England (r. 1399-1413), Prince Henry established himself as a fine military leader in battles against English and Welsh rebels in the first...

Thomas Cromwell (l. c. 1485-1540 CE) served as chief minister to Henry VIII of England (r. 1509-1547 CE) from 1532 to 1540 CE. With his king and the Archbishop of Canterbury Thomas Cranmer (in office 1533-55 CE), Cromwell masterminded...