On May 30, 1814 (julian calendar May 18), Russian revolutionary and philosopher Mikhail Alexandrovich Bakunin was born. Although many scholars argue if he is the founder of anarchist theory in general, he was the leading theorist of collectivist anarchism.
On May 29, 1880, German historian and philosopher Oswald Arnold Gottfried Spengler was born. He is best known for his book The Decline of the West (Der Untergang des Abendlandes), published in 1918 and 1922, covering all of world history. He proposed a new theory, according to which the lifespan of civilizations is limited and ultimately they decay.
On 16 March 1938, at about 22:00, two SA men arrived at the house of prominent Austrian philosopher, historian, journalist and critic Egon Friedell to arrest him. While they were still arguing with his housekeeper, Friedell committed suicide by jumping out of the window. Before leaping, he warned pedestrians walking on the sideway where he hit by shouting "Watch out! Get out of the way!". This was the tragic end of a brilliant mind.