May 21 in history: • 1138 – The Crusades: The siege of Shaizar ended, and the Emir of Shaizar became a vassal of the Byzantine Empire. → go there • 1864 – American Civil War: The inconclusive Battle of Spotsylvania Court House in Virginia ended with combined Union and Confederate casualties totaling around 31,000. → go there • 1925 – The opera Doktor Faust, unfinished when composer Ferruccio Busoni (pictured) died, was premiered in Dresden. → go there • 1946 – While working with a mass of plutonium known as the demon core, Manhattan Project physicist Louis Slotin accidentally exposed himself to a lethal dose of hard radiation, making him the second victim of a criticality accident in history. → go there • 2015 – Islamic State militants entered the ancient city of Palmyra. → go there Born 1806: Harriet Sutherland-Leveson-Gower, Duchess of Sutherland Wiki link Born 1855: Ella Stewart Udall Wiki link Born 1976: Stuart Bingham Wiki link Died 1981: Patsy O'Hara Wiki link Pictured: Busoni c. 1897.