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Peter I of Russia (Peter the Great) was the Tsar of Russia from 1682-1721 and Emperor of Russia from 1721-1725. During his long reign, Peter had absolute power and brought real change to Russia, including building its first navy...

The Goths were a Germanic tribe who are frequently referenced for their part in the fall of the Roman Empire and their subsequent rise to power in the region of northern Europe, initially in Italy. Prior to their contact with Rome...

Ogedei Khan (aka Ogodei) ruled the Mongol Empire from 1229 to 1241. He was the third son of Genghis Khan (r. 1206-1227), the empire's founder. Ogedei's accomplishments included creating a new capital at Karakorum, establishing a system...

The Hundred Days refers to the second reign of French Emperor Napoleon I, who unexpectedly returned from exile to reclaim the French throne. It encompasses Napoleon's triumphant return to Paris on 20 March 1815, his climactic defeat...

The Treaty of Brest-Litovsk, signed on 3 March 1918, outlined the harsh conditions under which the crumbling Russian Empire withdrew from the First World War (1914-18). Negotiated by Vladimir Lenin (1870-1924), the leader...

The Paris Peace Conference, held from January 1919 to January 1920 and attended by the victorious Allied powers, debated and agreed the terms of the peace settlement that formally ended the...

Einsatzgruppen ('deployment groups') were secret Nazi killing units, who systematically sought out and murdered civilians identified as enemies of the Third Reich. Operating without any legal restrictions...

Reinhard Heydrich (1904-1942) was a lieutenant-general in the Nazi SS organisation, Gestapo chief, and head of Reich security. A favourite of Adolf Hitler (1889-1945), Heydrich controlled...

Johannes Hevelius (1611-1687) was a Polish astronomer based in Danzig (Gdańsk). He worked from his own privately funded observatory, creating maps of the Moon's surface, discovering the first variable star, and spotting several...

The Junkers Ju 87 'Stuka' was a two-seater dive-bomber plane used by the German Air Force (Luftwaffe) in various theatres of the Second World War (1939-45). The Stuka, with its distinctive angled wings, excelled when combined with...