Ecumenical Councils: Did you mean...?

The Doge's Palace, or Palazzo Ducale, in Venice, Italy, was the seat of power of one of the world's most powerful city-states, as the Venetian Republic dominated the Mediterranean for centuries. The bright façade of the...

Katharina Zell (also known as Katharina Schütz, Katharina Schütz-Zell, l. 1497-1562) was a reformer, theologian, and prolific writer in Strasbourg who helped establish the basic tenets of the Protestant Reformation without advancing...

Constantine IV ruled as emperor of the Byzantine empire from 668 to 685 CE. His reign is best remembered today for the five-year Arab siege of Constantinople from 674 CE, which the Byzantines resisted thanks to their strong fortifications...

The Byzantine Empire existed from 330 to 1453. It is often called the Eastern Roman Empire or simply Byzantium. The Byzantine capital was founded at Constantinople by Constantine I (r. 306-337). The Byzantine Empire varied in...

The Empire of Nicaea was a successor state to the Byzantine Empire, or rather a Byzantine Empire in exile lasting from 1204 to 1261 CE. The Empire of Nicaea was founded in the aftermath of the sacking of Constantinople during...

Soviets, often called Soviets of Workers' Deputies, were worker councils first formed during the Russian Revolution of 1905 when a general strike was called against the Tsarist regime. Factory and...

The Index of Prohibited Books (Index Librorum Prohibitorum) was a list of written works condemned as heretical or injurious to the Christian faith by the Catholic Church at the Council of...

The Bolshevik Revolution occurred on 7 November 1917 (old calendar 25 October) and established a new republic: Soviet Russia. The Bolsheviks were radical socialists led by Vladimir Lenin...

Anglo-Saxon warfare was characterised by frequent and violent conflicts between petty kings, which ultimately led to the rise of larger kingdoms such as the Kingdom of Mercia, the Kingdom of Northumbria, and the Kingdom of...

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...