Frederick I: Did you mean...?

The Knight’s Revolt (1522-1523) was a military action led by the German imperial knight Franz von Sickingen (l. 1481-1523) and encouraged by the knight and writer Ulrich von Hutten (l. 1488-1523) launched to restore the status of the imperial...

Manuel I Komnenos was emperor of the Byzantine Empire from 1143 to 1180 CE. Manuel continued the ambitious campaigns of his grandfather Alexios I and father John II to aggressively expand the boundaries of his empire. Manuel turned out to...

Catherine II of Russia (Catherine the Great) was empress regent of Russia from 1762-1796. She was born in Prussia to Prince Christian August of Anhalt-Zerbst (1690-1747) and Princess Johanna Elisabeth of Holstein-Gottorp (1712-1760), and...

Johann Tetzel (l.c. 1465-1519) was a Dominican Friar who became famous as one of the most effective indulgence salesmen and who inadvertently inspired the Protestant Reformation when Martin Luther (l. 1483-1546) wrote his 95 Theses protesting...

William IV of Great Britain (r. 1830-1837) succeeded his elder brother George IV of Great Britain (r. 1820-1830) to become the fifth Hanoverian monarch. William had a successful naval career, and his reign is best remembered for the democratic...

The Crusades were a series of military campaigns organised by popes and Christian western powers to take Jerusalem and the Holy Land back from Muslim control and then defend those gains. There were eight major official crusades between 1095...

The Protestant Reformation (1517-1648) refers to the widespread religious, cultural, and social upheaval of 16th-century Europe that broke the hold of the medieval Church, allowing for the development of personal interpretations of the Christian...

The German Crusade of 1197 CE, also known as the 'Emperor's Crusade', was led by the Holy Roman Emperor Henry VI (r. 1191-1197 CE). Although the emperor died on his way east, his army did capture Beirut from the forces of the Ayyubid dynasty...

The medieval indulgence was a writ offered by the Church, for money, guaranteeing the remission of sin, and its abuse was the spark that inspired Martin Luther's 95 Theses. Luther (l. 1483-1546) claimed the sale of indulgences was unbiblical...

Although John Lloyd Stephens and Frederick Catherwood are consistently credited with the `discovery' of the Maya Civilization, there were many who preceded them who sparked their interest in making their famous travels through Mesoamerica...