On April 14, 1471, in the Wars of the Roses, the Battle of Barnet was fought. In this battle, Yorkists defeated the Lancastrians and killed the Earl of Warwick. — April 14, 1775: The first abolitionist society in US was organized in Philadelphia. — On this day in 1865, just after the effective end of the American Civil War, U.S. President Abraham Lincoln was shot by John Wilkes Booth while attending a production at Ford’s Theatre in Washington, D.C., and died the next morning. Also on April 14, 1865, U.S. Secretary of State William H. Seward and his family were …