Definitions

Johannes Kepler (1571-1630) was a German astronomer and mathematician most famous for creating what was up to that point the most accurate model of planetary astronomy with his three laws of planetary motion. Kepler was the first to present...

Andreas Vesalius (1514-1564) was the most celebrated anatomist in Europe during the 16th century and a key figure of the Scientific Revolution. Vesalius' great work was his On the Fabric of the Human Body, which contains over 250 remarkable...

The Plains Indians (also known as Native Americans of the Plains and Prairie, Indigenous Peoples of the Great Plains) are the original inhabitants of the western plains of North America, now part of the United States and Canada. They are...

The French Revolutionary Wars (1792-1802) were a series of conflicts that arose from the tensions surrounding the French Revolution (1789-1799). The wars were fought between Revolutionary France and several European powers, most notably Austria...

Napoleon's invasion of Russia, also known as the Second Polish War or, in Russia, as the Patriotic War of 1812, was a campaign undertaken by French Emperor Napoleon I (r. 1804-1814; 1815) and his 615,000-man Grande Armée against the Russian...

Alchemy is an ancient practice aimed at recreating precious substances using recipes and transformative materials such as the philosopher's stone. Alchemists believed that materials like gold, silver, gems, and purple dye could be recreated...

The quaestor ("the one who asks questions") was the oldest and lowest office on the cursus honorum, or "path of honor" in ancient Rome. Considered a stepping stone to higher office in the Roman government, the duties of the quaestor ranged...

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...

The Native Peoples of North America (also known as American Indians, Native Americans, Indigenous Americans, and First Americans) are the original inhabitants of North America believed to have migrated into the region between 40,000-14,000...

The War of the Fifth Coalition (1809) was a major conflict of the Napoleonic Wars (1803-1815) that was fought primarily in Central Europe between the First French Empire and its client states against the Austrian Empire, supported by the...