I thought that 100 is too much (especially if we have to discuss everybody's choice) and 10 too few, so 25 should be a good number. Make you list !
NB : Naturally, despotic/totalitarian rulers have more chances to be in the list as they had more power to personally make things happen.
Here is mine (by category and chronogical order) :
Rulers
Alexander the Great : Hellenised the Middle-East with cultural and politcial effects lasting for centuries
Julius Caesar : conquered Gaul, paved the way to Britain, and set foundation of the Roman Empire
Octavianus Augustus Caesar : first and possibly greatest Roman emperor
Charlemagne : founded Europe's longest lasting empire
Godfrey of Bouillon : leader of the first crusade, staring centuries of hostilities between Christianity against Islam.
Genghis Khan : changed the political face of Asia
Lorenzo de' Medici : allowed the artistic Renaissance of Europe thanks to his liberal rule and philanthropy.
Napoleon : spread the ideas of the enlightment and the French revolution across Europe, and uniformised legislation and mesaure units in many countries.
Queen Victoria : ruled over the largest empire ever, giving her name to numerous places around the world.
Adolph Hitler : caused WWII in Europe.
Emperor Hirohito : "supervised" WWII in Asia and the economic boom of Japan
Others
Siddhartha Gautama : changed the world by creating Buddhism
Confucius : influenced Sino-Koreo-Japanese thinking and culture
Socrates : influenced Western thinking and culture
Plato : influenced Western thinking and culture
Aristotle : influenced Western thinking, culture and sciences
Jesus Christ : changed the world by creating Christianity
Mohammed : changed the world by creating Islam
Christopher Columbus : changed the world by discovering the Americas
Martin Luther : Reformed Christianity, sparkling wars between Catholics and Protestant
Isaac Newton
Thomas Edison
Karl Marx : father of communism, which changed the 20th century
Albert Einstein : changed modern sciences with its relativity, and allowed nuclear sciences.
Sigmund Freud : invented psychoanalysis
NB : Naturally, despotic/totalitarian rulers have more chances to be in the list as they had more power to personally make things happen.
Here is mine (by category and chronogical order) :
Rulers
Alexander the Great : Hellenised the Middle-East with cultural and politcial effects lasting for centuries
Julius Caesar : conquered Gaul, paved the way to Britain, and set foundation of the Roman Empire
Octavianus Augustus Caesar : first and possibly greatest Roman emperor
Charlemagne : founded Europe's longest lasting empire
Godfrey of Bouillon : leader of the first crusade, staring centuries of hostilities between Christianity against Islam.
Genghis Khan : changed the political face of Asia
Lorenzo de' Medici : allowed the artistic Renaissance of Europe thanks to his liberal rule and philanthropy.
Napoleon : spread the ideas of the enlightment and the French revolution across Europe, and uniformised legislation and mesaure units in many countries.
Queen Victoria : ruled over the largest empire ever, giving her name to numerous places around the world.
Adolph Hitler : caused WWII in Europe.
Emperor Hirohito : "supervised" WWII in Asia and the economic boom of Japan
Others
Siddhartha Gautama : changed the world by creating Buddhism
Confucius : influenced Sino-Koreo-Japanese thinking and culture
Socrates : influenced Western thinking and culture
Plato : influenced Western thinking and culture
Aristotle : influenced Western thinking, culture and sciences
Jesus Christ : changed the world by creating Christianity
Mohammed : changed the world by creating Islam
Christopher Columbus : changed the world by discovering the Americas
Martin Luther : Reformed Christianity, sparkling wars between Catholics and Protestant
Isaac Newton
Thomas Edison
Karl Marx : father of communism, which changed the 20th century
Albert Einstein : changed modern sciences with its relativity, and allowed nuclear sciences.
Sigmund Freud : invented psychoanalysis