15 May 1905

The city of Las Vegas is founded in Nevada, United States. Las Vegas, known for its vibrant nightlife and sprawling casinos, has a rich and…

15 May 221

Liu Bei, Chinese warlord, proclaims himself emperor of Shu Han, the successor of the Han dynasty. Liu Bei was a prominent warlord and political figure…

15 May 1252

Pope Innocent IV issues the papal bull ad extirpanda, which authorizes, but also limits, the torture of heretics in the Medieval Inquisition.

15 May 495 BC

A newly constructed temple in honour of the god Mercury was dedicated in ancient Rome on the Circus Maximus, between the Aventine and Palatine hills….

15 May 1648

The Treaty of Westphalia is signed. The Peace of Westphalia refers to the pair of treaties signed in October and May 1648 which ended both…

15 May 1929

A fire at the Cleveland Clinic in Cleveland, Ohio kills 123 people. The Cleveland Clinic fire was a major structure fire at Cleveland Clinic in…

15 May 1958

The Soviet Union launches Sputnik 3. On May 15, 1958, the USSR launched its Third Artificial Satellite. While two previous Soviet orbiters were propelled into…

15 May 2011

The Anti-austerity movement in Spain begins protests in 58 Spanish cities.