June 15: Trinity Sunday (2025) Sallie Gardner at a Gallop 1215 – King John of England and a group of rebel barons agreed on the text of Magna Carta, an influential charter of rights. 1800 – War of the Second Coalition: The signing of the Convention of Alessandria brought temporary peace between France and Austria. 1878 – Eadweard Muybridge took a series of photographs to prove that all four feet of a horse leave the ground when it gallops (animation pictured), which became the basis of motion pictures. 1944 – World War II: The United States Army Air Forces began its first air raid on the Japanese archipelago, although little damage was caused. 1996 – The Troubles: The Provisional Irish Republican Army detonated a truck bomb in the commercial centre of Manchester, England, injuring more than 200 people and causing widespread damage to buildings. Lisa del Giocondo (b. 1479)Adam Eckfeldt (b. 1769)James K. Polk (d. 1849)Hoshi (b. 1996) More anniversaries: June 14 June 15 June 16 Archive By email List of days of the year About