Definitions

Aristarchus of Samos (l. c. 310 - c. 230 BCE) was a Greek astronomer who first proposed a heliocentric model of the universe in which the sun, not the earth, was at the center. Although his theory was noted by other thinkers of his time...

The Parthian cataphract was a heavy cavalry unit of Parthian warfare, an entirely armored, huge fast horse mounted by a completely armored rider, equipped with a long lance and a long sword. Like a modern tank designed to smash through enemy...

A martyr is someone who voluntarily dies for either a religious or secular cause. The word originates from "witness" in Greek and is related to a witness in court testifying to one's beliefs or truth, despite the risk involved. As such, it...

The Grand Remonstrance of 1641 was a list of grievances issued by Parliament against King Charles I of England (r. 1625-1649). It recorded what Parliament saw as the monarch's abuse of power, his illegal raising of taxes outside Parliament...

Ancient Greek astronomy was the study of the universe to understand how it functioned and why apart from the established theistic model that claimed all things were ordered and maintained by the gods. Ancient Greek astronomers relied on observation...

The Twelve Articles (1525) is a document written between 27 February and 1 March 1525 addressing grievances of the peasants of the Germanic regions of the Holy Roman Empire against the policies of their lords. The work was written to explain...

The Zealots were a group of Jews who began to emerge as a religious/political movement around the beginning of the 1st century CE. They strongly opposed Roman rule and turned on everyone, including other Jews, who cooperated with Rome. A...

Thomas Müntzer (l. c. 1489-1525) was a German theologian and apocalyptic preacher who became one of the leaders of the German Peasants' War (1524-1525). An early follower of the reformer Martin Luther (l. 1483-1546), Müntzer established his...

The Samaritans are a religious sect of ethnic Jews living near Mount Gerizim, Nablus, Hebron, and the West Bank in Israel. This community differs from mainstream Judaism by claiming that followers only accept the five books of Moses (Torah...

Melissus of Samos (l. c. 5th century BCE) was a Greek philosopher of the Eleatic School, considered the third great proponent of that philosophy's claim that reality is One, after Parmenides (l. c. 485 BCE) and Zeno of Elea (l. c. 465 BCE...