steel industries. The workers demand 23 shillings minimum wage. May 14 – New York Governor William Sulzer approves the charter for the Rockefeller Foundation, which begins operations with a $100,000,000 donation from John D. Rockefeller. May 24–25 – Adolf Hitler moves from Vienna to Munich. May 24 – Princess Victoria Louise of Prussia marries Prince Ernest Augustus of Hanover in Berlin, ending the decades-long rift between the Houses of Hohenzollern and Hanover and marking the last great gathering of European sovereigns. May 26 (May 13 O.S.) – Igor Sikorsky becomes the first person to pilot a 4-engine fixed-wing aircraft. May 29 – The ballet The Rite of Spring (music by Igor Stravinsky, conducted by Pierre Monteux, choreography by Vaslav Nijinsky and design by Nicholas Roerich) is premiered by Sergei Diaghilev's Ballets Russes, at the Théâtre des Champs-Élysées in Paris; its modernist style provokes one of the most famous classical music riots in history. The audience includes Gabriele D'Annunzio, Coco Chanel, Marcel Duchamp, Harry Graf Kessler and Maurice Ravel. May 30 – First Balkan War: The Treaty of London is signed, ending the war. Greece is granted those parts of southern Epirus which it does not already control, and the independence of Albania is recognised. June June 1 – The Greek–Serbian Treaty of Alliance is signed, paving the way for the Second Balkan War. June 4 – Emily Davison, a British suffragette, runs out in front of the King's horse, Anmer, at The Derby. She is trampled and dies four days later in hospital, never having regained consciousness. June 8 – The Deutsches Stadion in Berlin is dedicated with the release of 10,000 pigeons, in front of an audience of 60,000 people. It had been constructed in anticipation of the 1916 Summer Olympics (later to be cancelled as the result of World War I). June 11 Women's suffrage is enacted in Norway. Battle of Bud Bagsak: Armed with guns and heavy artillery, U.S. and Philippine troops under General John J. "Black Jack" Pershing fight a four-day battle against 500 Moro rebels, who are armed mostly with kampilan swords. The rebels are killed in a final desperate charge on June 15. June 18 – The Arab Congress of 1913 opens, during which Arab nationalists meet to discuss desired reforms under the Ottoman Empire. June 19 – The Parliament of South Africa passes the Natives Land Act, limiting land ownership for blacks to